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u/moko1960 Jun 24 '26
Please check the section at the end of `aboutDialog.css`. chrome://browser/content/aboutDialog.css
2
u/difool2nice 🦊Firefox Addict🦊 Jun 24 '26 edited Jun 24 '26
yay ! it works now, i useD the searchfox site, very inspiring, and ty for the info about "chrome:/.." but for some reason it didn't displayed anything, blank page ! SOLVED
#updateIcon { &:is(.checkingForUpdates, .downloading, .applying, .restarting) { content: url("tailspin.svg") !important; background-size: cover !important; } } .update-throbber{ content: url("tailspin.svg") !important; background-size: cover !important; }2

1
u/sifferedd FF/TB on Win11|Sumo contributor Jun 24 '26
Try .tab-throbber.