If there are problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.

Download a new copy of the Firefox program and save the disk image (dmg) file to the desktop

• Firefox 12.0.x: http://www.mozilla.org/en-US/firefox/all.html

• Trash the current Firefox application to do a clean (re-)install
• Install the new version that you have downloaded

Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data if you uninstall and (re)install Firefox.

• http://kb.mozillazine.org/Profile_folder_-_Firefox

Corel- Thanks for info...But when I download it(version 12),it goes straight to Downloads..then when I click on the dmg file....it says....'does not recognise this file'..and it wont open....I even put the dmg file,from Downloads, onto my Desktop,then clicked on it-and said the same thing..does not recoginze file etcetc...so Im stuck.. Any tips..? Thanks

UPDATE::**Corel- got it to work!.........I opened the dmg File from preview..and it worked...did all the things you mentioned Thanks much.

I can't even get the DMG to download! I end up with a "finished" file that is @ 350K.

I tried wired and wireless connections, Firefox and Safari!

I am currently trying to download it on a PC and it is doing better, but why the extra step?

using Lion, BTW.

Try emeailing this dude....webmaster@mozilla.org The only email address for so-called 'tech' support... Make sure you delete your old Firefox..after downloading..before installing..