the update to 29 caused me problems, it got real SLUGGISH and unresponsive on Win8
other people had problems including a friend of ours
i uninstalled it and installed Ver 25
everything is running well right now
i did the same for our lady friend
go here for instructions
http://kb.mozillazine.org/Go_back_to_an_old_version_of_Firefoxgo here to get Old Versions
http://www.oldapps.com/firefox.php?old_firefox=13346this website was clean when i used it and connected directly to mozilla.org for the old versions
be careful be sure you are down loading a multi megabyte firefox file
and NOT a KB installer pkg
which will run and install "crap" on the pc while installing FF
example FF-25 is 22.22 MB