Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
2. Under "Time range to clear", select "Everything".
3. Now, click the arrow next to Details to toggle the Details list active.
4. From the details list, check Cache and Cookies and uncheck everything else.
5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

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I've already done this and it didn't change anything

The Leaving from and Going to fields have an autocomplete=off attribute and Firefox doesn't store form data that you type in such a field.

You can remove autocomplete=off with a bookmarklet to make Firefox save the form data.

• http://kb.mozillazine.org/User_name_and_password_not_remembered