Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

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

thx for reply

didn't work

so removed firefox and my old profile and reinstall it

the same but less time .. 5 or 10 click

download beta 13 ..the same

all website work fine only fb and sometime gmail

also bake to ver 11 .. work fine

i see this post

= http://superuser.com/questions/421638/firefox-hanging-issue-on-facebook

Same here, Firefox 12 under Windows and when trying to close the Facebook tab, it hangs for quite some time, unless I close and reopen Firefox entirely.

My suspicion is not on any Firefox extensions, but on an unfortunate combination of ban effects:

   For one, my internet connection is slow. Sometimes requests take ages to either start or time out.

   Secondly I suspect Facebook using an AJAX request in the OnUnload event, which basically delays the page close until the script decided whether closing is allowed or not.

The problem is, web designers these days can no longer imagine that people will notice these requests because they take so long on their connection.

=

so i install noscript , forbid firefox , it work perfect finally so any help ? thx

fixed after ver 13 update