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The download link of CSS theme doesn’t work. So I created a folder chrome and pasted the text into a userChrome.css file.
But it just shows a black rectangle :(
Take a look at this, perhaps its what you are looking for?
https://addons.mozilla.org/en-US/firefox/addon/tab-preview-on-hover
The download link of CSS theme doesn’t work. So I created a folder chrome and pasted the text into a userChrome.css file.
But it just shows a black rectangle :(
Did you toggle on toolkit.legacyUserProfileCustomizations.stylesheets? Firefox stopped parsing userChrome.css by default since several years ago.
Yes I did… Is it working for you?