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).

  • It seems, I found correct place, but can't reproduce glow effect at all. Can you help me? – Eir Nym Mar 17 '13 at 7:40

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"]) > .tab-stack > .tab-content {
  background-image: none !important;


#tabbrowser-tabs > .tabbrowser-tab > .tab-stack > .tab-background * {
    background: none !important;

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

  1. https://www.userchrome.org/how-create-userchrome-css.html
  2. https://bugzilla.mozilla.org/show_bug.cgi?id=1541233
  • i was able to use those to write a userChrome.css setting that works. i've added it to your answer; please accept that edit when you get a chance. thanks again!!! – ryan Mar 18 '13 at 18:24
  • 1
    updated again to handle all parts of the glow. (some had still been showing for the last few firefox releases.) – ryan Jun 13 '13 at 4:03
  • .tabbrowser-tab > .tab-stack > .tab-content[pinned][titlechanged]:not([visuallyselected="true"]) { as of FireFox 44 (at least) – Tim Morgan Mar 9 '16 at 17:06
  • Had adapted this answer to .tab.pinned { background-image: none !important; } but it doesn't appear to work anymore as of FF 64.0. – Daniel Dec 15 '18 at 19:22

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