Mozilla Firefox allows you to set a Master password to protect your locally stored usernames, passwords and certificates. Its an extra security mechanism and can protect your sensitive data.
But what will you do if you forget the master password? In that case, following simple steps will help you in resetting it. But remember resetting master password will also remove all locally saved usernames, passwords and certificates.
1. Open Mozilla Firefox and enter following URL in addressbar:
chrome://pippki/content/resetpassword.xul
2. It'll show you a page with a warning that all stored data will be removed and "Reset" button at bottom.

3. Click on "Reset" button and it'll immediately reset the master password.
This article was posted by VG in following section: Mozilla Firefox, Troubleshooting.
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didut
i use Firefox portable now. how can i export & import all password from my old firefox?
VG
^^ Copy following files from your old firefox profiles folder and paste them in your portable firefox profile folder:
key3.db
signons3.txt
permissions.sqlite
cookies.sqlite
To know the profile folder path, visit following tutorial:
http://www.askvg.com/list-of-files-that-can-be-hacked-to-configure-firefox/