Firefox will no longer open completely. My home page appears, but I can't do anything with it. See "details" box for full description.

Firefox will no longer open completely. My home page appears, but I can't do anything with it--can't use "Help," can't search the Web, can't even use "Sign Out." I have to close it entirely to get out of it. A box comes up and says "Yahoo Mail is loading especially slowly" and tells me my computer speed is slow. But this is the same computer I've always used for Firefox, and Yahoo comes up quickly and completey through Internet Explorer (which is how I'm sending this message). Can anyone help me load Firefox so that it works? I even downloaded the latest version of Firefox, but it makes no difference. Thanks.

Do a clean reinstall and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\) before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 15.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
You can also try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that works.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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