Add the tab sidebar feature and automatically hide the top tab bar.The tab sidebar supports permalinks and opens in a small window
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I've been waiting for years for Mozilla to allow users to hide the tab bar.
It would be nice to have a built-in tab-side-bar but allowing us to hide the tab-bar most definitely should be a must. There already are add-ons like Sibery that provide a great side-bar experience.
You're not alone. TRhere's a whole Community around vertical, auto-or button hidden Tabbars:
Oh I see something similar is voted here: