Did you check the home page setting to make sure that it is still correct?

• Tools > Options > General > Startup: Home page
• https://support.mozilla.org/kb/How+to+set+the+home+page

Firefox supports multiple home pages separated by '|' (pipe) symbols.

You can check the target line in the Firefox desktop shortcut (right-click: Properties) to make sure that nothing is appended after the path to the Firefox program.

You can check for problems with preferences.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences

My home page setting under tools is proper, nothing has changed there.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

It appears I have this issue resolved. NOW, another issue has arisen, when I go to my home page (http://www.weather.com/weather/today/87124:4:US) the US is not capitalized anymore, instead it is "us" which comes up with this message ... "Oh no! The page you are looking for does not exist. Go back, friend, go back!" I keep changing it in the Tools Options area with the above link and I save it. Next time I go online instead of going to http://www.weather.com/weather/today/87124:4:US it goes to http://www.weather.com/weather/today/87124:4:us instead.

Does this also happen in Safe Mode and in normal mode with all extensions disabled?

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

It is also possible that some security software is changing the URL to lowercase.

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/