diff --git a/css/properties/-moz-border-bottom-colors.json b/css/properties/-moz-border-bottom-colors.json
deleted file mode 100644
index d01b8099069f21..00000000000000
--- a/css/properties/-moz-border-bottom-colors.json
+++ /dev/null
@@ -1,64 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-border-bottom-colors": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/-moz-border-bottom-colors",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "1",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "firefox_android": {
-              "version_added": "4",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/properties/-moz-border-left-colors.json b/css/properties/-moz-border-left-colors.json
deleted file mode 100644
index 2fb8abf897409d..00000000000000
--- a/css/properties/-moz-border-left-colors.json
+++ /dev/null
@@ -1,64 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-border-left-colors": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/-moz-border-left-colors",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "1",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "firefox_android": {
-              "version_added": "4",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/properties/-moz-border-right-colors.json b/css/properties/-moz-border-right-colors.json
deleted file mode 100644
index 36f09ef43c0466..00000000000000
--- a/css/properties/-moz-border-right-colors.json
+++ /dev/null
@@ -1,64 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-border-right-colors": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/-moz-border-right-colors",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "1",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "firefox_android": {
-              "version_added": "4",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/properties/-moz-border-top-colors.json b/css/properties/-moz-border-top-colors.json
deleted file mode 100644
index 7185e235e3557d..00000000000000
--- a/css/properties/-moz-border-top-colors.json
+++ /dev/null
@@ -1,64 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-border-top-colors": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/-moz-border-top-colors",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "1",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "firefox_android": {
-              "version_added": "4",
-              "version_removed": "59",
-              "notes": [
-                "In Firefox 59, the property was limited to usage in chrome code only (See <a href='https://bugzil.la/1417200'>bug 1417200</a>).",
-                "In Firefox 60, the property was removed completely (See <a href='https://bugzil.la/1429723'>bug 1429723</a>)."
-              ]
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/properties/-moz-text-blink.json b/css/properties/-moz-text-blink.json
deleted file mode 100644
index d3c4c2a3ef3d04..00000000000000
--- a/css/properties/-moz-text-blink.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-text-blink": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/-moz-text-blink",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "6",
-              "version_removed": "26"
-            },
-            "firefox_android": {
-              "version_added": "6",
-              "version_removed": "26"
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/properties/-moz-window-shadow.json b/css/properties/-moz-window-shadow.json
deleted file mode 100644
index 7c6a210761bcca..00000000000000
--- a/css/properties/-moz-window-shadow.json
+++ /dev/null
@@ -1,353 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-window-shadow": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/-moz-window-shadow",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "3.5",
-              "version_removed": "44",
-              "notes": [
-                "Supported only on macOS",
-                "In Firefox 44, the property was limited to usage in chrome code only."
-              ]
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "qq_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "uc_android": {
-              "version_added": false
-            },
-            "uc_chinese_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        },
-        "default": {
-          "__compat": {
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": "3.5",
-                "version_removed": "44"
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "qq_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "uc_android": {
-                "version_added": false
-              },
-              "uc_chinese_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": false,
-              "deprecated": true
-            }
-          }
-        },
-        "menu": {
-          "__compat": {
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": "4",
-                "version_removed": "44"
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "qq_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "uc_android": {
-                "version_added": false
-              },
-              "uc_chinese_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": false,
-              "deprecated": true
-            }
-          }
-        },
-        "none": {
-          "__compat": {
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": "3.5",
-                "version_removed": "44"
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "qq_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "uc_android": {
-                "version_added": false
-              },
-              "uc_chinese_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": false,
-              "deprecated": true
-            }
-          }
-        },
-        "sheet": {
-          "__compat": {
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": "4",
-                "version_removed": "44"
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "qq_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "uc_android": {
-                "version_added": false
-              },
-              "uc_chinese_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": false,
-              "deprecated": true
-            }
-          }
-        },
-        "tooltip": {
-          "__compat": {
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": "4",
-                "version_removed": "44"
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "qq_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "uc_android": {
-                "version_added": false
-              },
-              "uc_chinese_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": false,
-              "deprecated": true
-            }
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-moz-full-screen-ancestor.json b/css/selectors/-moz-full-screen-ancestor.json
deleted file mode 100644
index dd3b257b3ce9d7..00000000000000
--- a/css/selectors/-moz-full-screen-ancestor.json
+++ /dev/null
@@ -1,57 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-moz-full-screen-ancestor": {
-        "__compat": {
-          "description": "<code>:-moz-full-screen-ancestor</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:-moz-full-screen-ancestor",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "10",
-              "version_removed": "50"
-            },
-            "firefox_android": {
-              "version_added": "10",
-              "version_removed": "50"
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-moz-system-metric.json b/css/selectors/-moz-system-metric.json
deleted file mode 100644
index 81b068d31fa573..00000000000000
--- a/css/selectors/-moz-system-metric.json
+++ /dev/null
@@ -1,625 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-moz-system-metric": {
-        "__compat": {
-          "description": "<code>:-moz-system-metric()</code>",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": false
-            },
-            "firefox": {
-              "version_added": "3",
-              "version_removed": "58",
-              "notes": "Internal only since Firefox 58 (See <a href='https://bugzil.la/1396066'>bug 1396066</a>)."
-            },
-            "firefox_android": {
-              "version_added": "4",
-              "version_removed": "58",
-              "notes": "Internal only since Firefox 58 (See <a href='https://bugzil.la/1396066'>bug 1396066</a>)."
-            },
-            "ie": {
-              "version_added": false
-            },
-            "opera": {
-              "version_added": false
-            },
-            "opera_android": {
-              "version_added": false
-            },
-            "qq_android": {
-              "version_added": false
-            },
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": {
-              "version_added": false
-            },
-            "samsunginternet_android": {
-              "version_added": false
-            },
-            "uc_android": {
-              "version_added": false
-            },
-            "uc_chinese_android": {
-              "version_added": false
-            },
-            "webview_android": {
-              "version_added": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        },
-        "images-in-menus": {
-          "__compat": {
-            "description": "<code>:-moz-system-metric(images-in-menus)</code>",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:-moz-system-metric/images-in-menus",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
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