I was running firefox 37.0.2 with kaspersky antivirus 2013 and zonealarm pro and didnt had any problems. After i updated to kaspersky antivirus 2015. I tried to launch firefox and it took very long to load up. When i try to search something on google it takes a long time to load a page. So i tried doing the refresh feature and it didn't work then i tried to update to the latest version 38.0.1, also didnt work. So ive installed kaspersky antivirus 2013 again and still firefox is slow. Ive tried refresh feature, cleaning cache, disable hardware acceleration and even went to firefox 34. None of these worked. When i launch firefox with firefox.exe -p and select a profile, firefox works fine, but when i launch it from taskbar it is very slow at start up and loading pages. And when i try to remove a profile, it ask me to delete the files. If i try to do that, it freeze up as well. So i can only manually delete the new profiles.