how to disable Firefox's app tab glow? I recently switched from Linux to Mac OS X, and one little tweak that didn't survive is disabling the blue highlight "glow" that Firefox adds to App Tabs when they have updates. Any idea how to do that?

I followed these instructions to disable it on Linux, but they don't work on Mac OS X. I have this in my ~/Library/Application Support/Firefox/Profiles/personal/chrome/userChrome.css file:

.tabbrowser-tab[pinned][titlechanged]:not([selected="true"]) {
    background-image: none !important;
    background: none !important;
}


...but no luck. Putting other CSS rules in that file does work though.

I'm on Firefox 19.0 on Mountain Lion (10.8.2).
Put one of these snippets in your userChrome.css file, depending on your Firefox version:

Firefox 69

Toggle toolkit.legacyUserProfileCustomizations.stylesheets to true in about:config as well as userChrome.css modification.

Firefox 29 (Australis)

.tabbrowser-tab[pinned][titlechanged]:not([selected="true"]) &gt; .tab-stack &gt; .tab-content {
  background-image: none !important;
}


Pre-29

#tabbrowser-tabs &gt; .tabbrowser-tab &gt; .tab-stack &gt; .tab-background * {
    background: none !important;
}


Discovered by looking for [titlechanged] selectors in browser.css (chrome://browser/skin/browser.css).


https://www.userchrome.org/how-create-userchrome-css.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1541233