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Used to happen to me when Firefox crashed and there is a copy of it running in the memory. Thus, your default profile is locked.
You could either:
1. Do a CTRL+ALT+DEL to remove the "undead" copy from the memory and then restart Firefox
2. Or reboot your PC.
If you choose to reboot, your default profile should be unlocked and restored back as usual.
If you choose the "end task" (or "end program") option, sometimes Firefox will not even launch properly after that, therefore I strongly suggest you to try the "reboot" method.
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