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Firefox for Mac

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Firefox displays white box behind all text. See screen shot.

Firefox displays white box behind all text. See screen shot.
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Hi rcmazzella, could you check this new issue as the first step:

Firefox 91 now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS. (release notes).

Is it possible you have that setting?

If so, please try one or both of these two options:

(1) Turn off the system-level setting. This appears to be the most effective workaround.

(2) Disable High Contrast mode in Firefox. See: Disable high contrast mode in Firefox.

For both changes, you might need to Quit Firefox and start it up again to see the normal display.

Any difference?