The guys over at Firefox Facts are explaining in an article how to backup the Firefox passwords manually. This is interesting for everyone who needs to quickly move passwords from one computer to another and those who want to backup their passwords regularly without using a Firefox password exporter extension.
All three files that need to be copied are located in the Firefox profile folder. This profile folder is normally located in your Application Data or AppData folder of the Windows user profile or ~/.mozilla/ in Unix or ~/Library/Mozilla/ and ~/Library/Application Support/ on a Macintosh.
The following three files contain all the information about the passwords: signons.txt, signons2.txt, key3.db. Moving them into another Firefox profile would remove the old passwords of that profile and replace them with the new ones.
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