I generally have a "home" Firefox window with my most used tabs pinned. Sometimes I close it before another window, so I was frustrated to "lose" it and having to redo my pins. But recently I discovered this feature. Joy!
@OP When you have continue session on, closing Firefox using burger menu->Quit restores all windows. I assume this will also keep the pins even without continue session.
I also like that its PDF viewer opens exactly at where I left it at.
Good tip, though I have just hidden the close button with userChrome.css. It does not protect against alt+f4, though..
Saved my butt a few times already.
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