Both Firefox 12 & 13 take forever to load all websites. Firefox 11 works great. What did you change to cause this problem starting with 12?

I keep having to go back to 11. Supposedly 12 was to be faster. Instead it takes minuets to load every website. I have tried several betas of 13 with the same problem.

Did you try a new profile for the Firefox 13 version?
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
You can try the portable Firefox version that comes with its own profile folder.
*http://portableapps.com/apps/internet/firefox_portable
You can install multiple Firefox versions via a custom install in different installation folders.<br />
Do a custom install and install each version in its own program folder to use multiple Firefox versions.
* https://support.mozilla.com/kb/Custom+installation+of+Firefox+on+Windows
Make sure not to start Firefox after the installation has finished.
Create a new profile exclusively for each Firefox version.
Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

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