T-bird 78.? Win10x64bit - How do I delete lost Master Password ?
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Follow these instructions if you're able to launch TB.
If not, open the profile folder, located by default in:
and delete or rename key4.db, cert9.db and logins.json. This will erase all account passwords.
What are the x's ?
The x are a random string of 8 numbers and characters, unique to each profile.