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Why has my toolbar text suddenly become yellow? And on tabs too? Updating Firefox did not help. Hacked?

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I just noticed that suddenly all my text on the tabs, toolbars is all yellow. WTF? Is this some sort of hack or something? Even the icons are yellow.

I have tried to load a screenshot but it is not working.

I just noticed that suddenly all my text on the tabs, toolbars is all yellow. WTF? Is this some sort of hack or something? Even the icons are yellow. I have tried to load a screenshot but it is not working.

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Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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You can attach a screenshot to a reply: https://support.mozilla.org/questions/1253928#question-reply

There was a glitch in Firefox's built-in "default" theme where it omitted to apply your Windows "accent" color, and that may have been fixed in Firefox 66. If that change makes the default theme unattractive, try the Light or Dark theme instead:

Built-in themes in Firefox - alternative to complete themes