http://www.macfixitforums.com/ubbthreads.php?ubb=showflat&Number=441910namely
exit safari
open terminal
type (or cut-n-paste)
defaults write com.apple.Safari IncludeDebugMenu 1hit return
reboot
in the new drop-down menu, select
agent and in the resulting list select a different browser
agentPeople have apparently had the same problem with Firefox
If you try this and it doesn't work or you really hate the new drop-down menu, I think this can be undone simply by
exit safari
open terminal
type (or cut-n-paste)
defaults write com.apple.Safari IncludeDebugMenu 0hit return
reboot
Another option would be to download another browser and see if it gives you better results; I'd suggest Opera, but Camino has fans in this forum, and there's a recent thread here on OmniWeb, too
http://www.opera.com/http://caminobrowser.org/http://www.omnigroup.com/applications/omniweb/