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Firefox browser renders incorrectly

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Firefox is not rendering pages correctly. Chrome renders correctly. Machine is in Mojave Firefox renders correctly on another machine (Catalina) with the same account login sync. It is very distracting as pages are rendered poorly. I tried disabling hardware acceleration; then restarted Firefox. No change. I uninstalled and re-installed Firefox Default (System) theme No optional extensions or plugins

Firefox is not rendering pages correctly. Chrome renders correctly. Machine is in Mojave Firefox renders correctly on another machine (Catalina) with the same account login sync. It is very distracting as pages are rendered poorly. I tried disabling hardware acceleration; then restarted Firefox. No change. I uninstalled and re-installed Firefox Default (System) theme No optional extensions or plugins

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This could be a problem with High Contrast Mode on Mac.

See "New" in the release notes.

Firefox now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS in the Accessibility settings.


Make sure you allow pages to choose their own colors.