Firefox is a free web browser from Mozilla and is written in open source code. On computers handled by the University running Windows or Linux operative system, it is part of the standard software package that is installed on UiB computers. For personal computers, you can download it from either http://firefox.no or http://mozilla.org.
Start - Support - Reset Firefox
NB: This procedure will only work for computers that are maintained by the IT-Department.
If you experience problems with Firefox, it will usually help to close the program entirely and run a script called Reset Firefox. To find this, you do the following:
Step 1: Press the Start-menu(Windows logo)
Step 2: Click on “All Programs” and select the folder called “Support”.
Step 3: Select the option called “Reset Firefox” to repair the Firefox web browser.
I have lost all my bookmarks in Mozilla.
Step 1: Open Mozilla web.
Step 2: Go to bookmarks -> Show all bookmarks.
Step 3: Choose Import and backup -> Import bookmarks from HTML-file.
Step 4: Select the HTML-file you want to import. E.g.: o:\mozilla\users\default\bookmarks.html.
Step 1: Restart the computer
Step 2: If this does not help, quit Firefox
Step 3: Add .old after the filename to the places.sqlite and places.sqlite-journal files on the Firefox profile.
Step 4: Restart Firefox
If this not work see a detailed guide on [Firefox's support page]