Multiple Windows, Single Session
What is Multiple Windows, Single Session?
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Add-on summary
I DO recommend closing your MAIN window LAST. Especially so, if you're using something like Tree Style Tabs.
What it does Basically, you close a window with the X and this addon will restart that window when Firefox reboots. If you want to permanently close a window, then use the addon button.
Update: Turns out pressing Ctrl+Q or closing from the menu does this (and works better).
It's written in purescript, which is honestly pretty terrible for this.(hindsight)
Contribs welcome: https://gitlab.com/losnappas/multiple-windows-single-session
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Add-on safety
Risk impact
Multiple Windows, Single Session may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Risk likelihood
Multiple Windows, Single Session is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.