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Password Manager settings
Firefox will remember passwords by default. You may have disabled this feature, or told Firefox to never remember passwords for a particular site.
1. At the top of the Firefox window, click on the Tools menu and select Options...
2. Select the Security panel.
3. If it isn't already check marked, check Remember passwords for sites.
4. To the right of Remember passwords for sites, click the Exceptions... button .
5. Make sure that the site you're trying to log in to isn't in the list.
* If it is, select the entry and click Remove.
1. Click Close
2. Click OK to close the Options window
Now that you've configured Firefox to remember passwords, try logging in to the site again.
Passwords being automatically cleared
Firefox may be set to remove saved passwords when it is closed. To undo this setting:
1. At the top of the Firefox window, click on the Tools menu and select Options...
2. Select the Privacy panel.
3. If Firefox will: is set to Use custom settings for history and Clear history when Firefox closes is selected, click on the Settings... button.
4. Make sure that Saved Passwords is not selected.
5. Click OK to close the Options window
Firefox is now configured to not clear your passwords when closing.