Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (MAC)

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

If you use extensions (Tools > Add-ons > Extensions) like Adblock Plus or NoScript or Flash Block that can block content then make sure that such extensions aren't blocking content.

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 or otherwise make changes.

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

Hi. Thanks for that steer. Problem turned out to come via "Stylish". A style to remove ads from eBay proved to be the root of the problem, and eBay was fully functional once I disabled the style. I really liked that style ... think I'll retain it for viewing, and disable it for selling!! Stylish makes that easy using the Firefox add-on toolbar. Byee Norm

Maybe you can use the build-in Firefox inspector to identify which rule(s) added by the stylesheet are causing this problem.

Current Firefox versions have a lot of web developer tools build-in.

• https://developer.mozilla.org/en/Tools

• https://developer.mozilla.org/en/Tools/Page_Inspector
• https://developer.mozilla.org/en/Tools/Page_Inspector/HTML_panel
• https://developer.mozilla.org/en/Tools/Page_Inspector/Style_panel