Please reload the webpage while bypassing the cache using one of the following steps:
Hold down the Shift key and click the Reload button with the left mouse key.
Press Ctrl + F5 or Ctrl + Shift + R (Windows and Linux)
Press Command + Shift + R (Mac)
See if this helps solve the issues you had and please report back to us!
Try the Firefox Safe Mode to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.
(If you're not using it, switch to the Default theme.)
You can open the Firefox 4.0+ Safe Mode by holding the Shift key when you use the Firefox desktop or Start menu shortcut.
Or use the Help menu item and click on the Restart with Add-ons Disabled... menu item while Firefox is running.
Don't select anything right now, just use "'Start in Safe Mode"To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again.If it is good in the Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one.