Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

• Don't make any changes on the Safe mode start window.

See:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
• Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

• Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
• Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

I too am having problems when using mouse each time i move the cursor there is a long delay before it actuates to next item. Any solution for this? dustime8

I have it regularly; i have it in safe mode; its still happens if I restart Firefox; it disappears if I restarts the PC, - but will eventually return. Its not simply restricted to opening an image in a page for example, it happens if Im uploading a file; changing pages; anything that requires the exchange of data with the web.

Windows 6 64 bit system, 12 Gb memory, 32 bit Firefox. I will try 64 bit Nakamora and update