I'll start: Opening new tabs all the way to the right or bottom, rather than next to the current tab. Its especially disorienting on vertical tabs, I lose track of which (I changed the setting but its still annoying on blank Firefox profiles).

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[–] 19 points 7 months ago

That closing the last tab closes the window instead of leaving you with a blank tab. And that there is not even an option in the UI to change this, and you have to go to about:config -> browser.tabs.closeWindowWithLastTab.

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