How to reset the master password in Firefox
Posted on March 26, 2005, under Security.
I’ve noticed a couple people coming to this site searching for help on resetting their master password in Mozilla Firefox, so I found help on this and am posting it here in case you happen to be one of those people. 
Master password - MozillaZine Knowledge Base
If you have lost or forgotten your Master Password or you want to disable the feature, reset your master password. Note that, upon resetting, you will lose all the stored information in the Passwords Manager as this is a built-in security feature to prevent people otherwise resetting your master password and gaining access to your passwords.
- For Firefox: go to “chrome://pippki/content/pref-masterpass.xul” (see Chrome URLs) and click on “Reset Password”.
- For Thunderbird: “Tools -> Options (Edit -> Preferences on Linux) -> Advanced -> Saved Passwords -> Master Password -> Reset Password”.
- For Mozilla Suite: “Edit -> Preferences -> Privacy & Security -> Master Passwords -> Reset Password”.
4 Replies to "How to reset the master password in Firefox"
jess on March 20, 2008
I’m sorry Paul, I haven’t used the 3 beta too much yet. You could try uninstalling, but I think the information is stored in a profile in a separate directory from the program install location.
Grace McGarvie on April 25, 2008
When I click on Reset password, nothing happens. It does not ask me for new password or anything. I have no idea what the original password was so cannot use change password feature
jess on April 25, 2008
Grace, are you using Thunderbird 1.5? If so, it might be worth upgrading to Thunderbird 2 and trying the new process mentioned in the article.
Paul Tormey on March 20, 2008
I do not remember setting a master password for Firefox 3 beta 4.
As such I can never get firefox to remember my passwords.
Do I need to uninstall firefox and then reinstall?