We use one desktop (Mac OSX 10.5.8) with individual accounts. Firefox work fine on one account but loads really slowly in other account. Version on firefox is 16.0.2 and it said its updated.
Update to the latest Firefox 18 on the Firefox download page and as you install it allow all users to access it, also update your Java Run time and Adobe Flashplayer
Unable to update. Its says need Mac OSX 10.6 or later. I'm running 10.5.
Any older version that can be used?
Download this one: http://www.mozilla.org/en-US/firefox/15.0/system-requirements/
Try to disable IPv6, but also check other suggestions: