Firefox will be working perfectly, but after a period of time, and sometimes after a period of inactivity, the browser just hangs.

Mouse clicks to hyperlinks instigate an error noise, and to recover your internet session, all you can do is re-start the PC - but also re-setting the router seems to clear the problem.
Its not the individual PC, as my netbook which i connect through the same router, has the same problem - nor is it the wireless connections, as when the devices are physically connected, it still occurs!
I have tried upgrading to mozilla v4 beta, no change, and i now taken a retrogade step and gone back to 3.6.13 - no change.

Sorry, I couldn't find any relevant Bugs with regards to that issue.
'''Try the Firefox SafeMode''' to see how it works there. <br />
''A troubleshooting mode, which disables most Add-ons.'' <br />
[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#w_safe-mode-window_2 Troubleshoot Firefox issues using Firefox SafeMode]
When in Safe Mode... <br />
* The status of plug-ins is not affected.
* Custom preferences are not affected.
* All extensions are disabled.
* The default theme is used, without a persona.
* userChrome.css and userContent.css are ignored.
* The default toolbar layout is used.
* The JIT Javascript compiler is disabled.
* Hardware acceleration is disabled.
* You can open the Firefox 15.0+ SafeMode by holding the '''Shft''' key when you use the Firefox desktop or Start menu shortcut.
* Or use the Help menu item, click on '''Restart with Add-ons Disabled...''' while Firefox is running.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shft key) to open it again.''
'''''If it is good in the Firefox SafeMode''''', your problem is probably caused by an extension, and you need to figure out which one. <br />
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes <br />
Or it might be caused by Hardware Acceleration.
''When you figure out what is causing that, please let us know. It might help other user's who have that problem.''

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