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alternative to OneTab?
(programming.dev)
A place to discuss the news and latest developments on the open-source browser Firefox
https://github.com/Redundakitties/colorful-minimalist/tree/main/hacks Check sideberyMods.css (you should add content of this file to your userChrome.css. If it doesn't work just search sidebery autohide on reddit.
Awesome, thanks!