Keep pinned tabs persistent

[eMpTy]

How pinned tabs currently work:

Window 1: 20 pinned tabs
Window 2: no pinned tabs

If I close Window 2 first and then Window 1, my pinned tabs will be there if I open Firefox again. If I however close Window 1 first, the pinned tabs won't be restored. This happens to me every once in a while and it really is a pain to go into my history and carefully restore the tabs, arrange them the way they were before and then pin them again.

I get the idea behind the current implementation but I believe that Firefox should do one of three things:

1. Act context-aware in this matter: If the session has two windows, one with pinned tabs and one without, the window with pinned tabs should always be the one restored upon the next launch.
   
   
2. Restore every window with pinned tabs by default (my preferred solution). If some users don't want that, they can simply unpin the tabs and then close the window. Unpinning existing tabs is way less of an hassle to restore accidentally closed tabs.
   
   
3. Ask the user if they want to keep the window with the pinned tabs at the next launch. A simple yes/no confirmation window would suffice. A "don't ask again" checkbox for users who strictly don't want this could be implemented as well.

By the way: Please don't merge this with Make pinned tabs persist between windows (by default). This is not the same and I frankly disagree with the idea.

[Jon]

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