Can the "glow" notification on Firefox 4's App Tabs be disabled?

Solution 1:

There is no option for this as far as I know, but you can disable or change the color in your userChrome.css.

If you've never done that, locate your Firefox profile, which will be placed dependent on you OS type (see How do I find my profile?).

Change to the chrome directory in it, and edit or create the userChrome.css file to contain these lines:

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

That should do it until Mozilla changes things.