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DmMacniel ,

Take a look at this, perhaps its what you are looking for?

addons.mozilla.org/en-US/…/tab-preview-on-hover

shub OP , (edited )

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 :(

TauZero ,

Did you toggle on toolkit.legacyUserProfileCustomizations.stylesheets? Firefox stopped parsing userChrome.css by default since several years ago.

shub OP ,

Yes I did... Is it working for you?

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