invisible controls
since the installation of version 91 on August 10, many pages (facebook in particular) are no longer displayed correctly, controls have become invisible (adjustment of the sound on videos in particular) or even backspace command when viewing images on Facebook
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Recent release notes say that Firefox automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS. It can be turned off in FF settings under General -> the Colors... button -> Override the colors specified by the page with your selections above -> Never.