Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and
• Remove Cookies

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Cookies; Delete cookies to remove the information websites have stored on your computer {web link}

• Cache; How to clear the Firefox cache {web link}

If there is still a problem, Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Did this help?

While you are in safe mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

Thanks Fred - turning off the hardware acceleration appears to have fixed it. At least, I can't recreate the problem!

I'd cleared the cache previously to get round this sort of issue, but it's a pretty ugly solution that causes more problems than it solves. One thing I just found was right-clicking the site on the history bar and selecting 'forget site' also worked - again, it's a solution, but it's better not to have a problem to resolve in the first place.

Hopefully, dropping the hardware acceleration has now solved it once and for all. Thanks again for the very quick and thorough solution.

Glad to help. Safe Surfing.

Note that you can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Thanks cor-el - that's an incredibly useful tip. It saves me from having to open private browsing, which has been my fallback position when I didn't want to delete my cache.

Another thing you can do it;

Type about:preferences#privacy<enter> in the address bar. The button next to History, select Use Custom Settings.

Turn on Remember My Browsing And Download History At the bottom of the page, turn on Clear History When Firefox Closes. At the far right, press the Settings button. Turn on ONLY Cache and Form And Search History leaving the others off.