userChrome.css

/*
uBlock Deluxe - Enhanced UI CSS overlay for uBlock Origin

https://github.com/Gitoffthelawn/uBlock-Deluxe

Designed for Mozilla Firefox

Copyright (c) 2015-2017 Gitoffthelawn. All rights reserved.
No warranties expressed or implied.  Used at your own risk.

If you are interested in this using this code or any of the resultant designs in another project, just ask by creating an issue on GitHub in this repository.

If you find this project helpful and would like to make a donation, you can pick a charity or ask me to pick one.
I am not accepting any money myself, but if my work helps any charities, that would make me happy.
Let me know if you are inspired to donate to a charity.
*/

/* -----------------------
    uBlock Origin: CHROME
    v3.0.5
   ----------------------- */

@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

/* uBlock Origin extension toolbar button: improve aesthetics when enabled */
#ublock0-button:not(.off) > .toolbarbutton-badge-stack > .toolbarbutton-icon {
   filter: hue-rotate(92deg) brightness(340%) !important; }
#ublock0-button:not(.off) .toolbarbutton-badge {
   background-color: #222222 !important; font-family: Tahoma !important; font-weight: normal !important; }

/* uBlock Origin extension button: enhance visibility when disabled by applying background color */
#ublock0-button.off { background-clip: content-box !important; background-color: red !important; }