Clear Cookies & Cache

• https://support.mozilla.com/en-US/kb/Template:clearCookiesCache

Clear the Network Cache

• https://support.mozilla.com/en-US/kb/How%20to%20clear%20the%20cache#w_clear-the-cache

Troubleshooting extensions and themes

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes

Check and tell if its working.

Done, and the issue is not resolved. I currently have no Firefox addons at all.

Create a New Profile as a test to check if your current profile is causing the problems.

-> Basic Troubleshooting: Make a New Profile

• https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting#w_8-make-a-new-profile

-> If that New Profile works then you can recover your Bookmarks and Passwords from the Old Profile.

-> Recovering important data from an old profile

• https://support.mozilla.com/en-US/kb/Recovering%20important%20data%20from%20an%20old%20profile

Check and tell if its working.

Hey, thanks for the help, but the new profile also had the problem.

Download Firefox 6.0.1 version:

• http://www.mozilla.com/en-US/firefox/new/
• http://www.mozilla.com/en-US/firefox/central/
• http://www.mozilla.com/en-US/firefox/fx/
• http://www.mozilla.com/en-US/firefox/all.html

Uninstall your current Firefox

• https://support.mozilla.com/en-US/kb/Uninstalling%20Firefox
• DO NOT SELECT TO REMOVE USER DATA AND SETTINGS

Install Firefox 6.0.1

• https://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Windows

Check and tell if its working.

Still hasn't fixed it, I've included a screenshot, where the cog is next to fridge is the cursor, the fridge is the thing that has been selected, the movement out is what roughly the amount of white space on the right.

Turn OFF Hardware Acceleration

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes#w_turn-off-hardware-acceleration

Check and tell if its working.

Nope, still off centre.

Test for faulty extensions

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes#w_test-for-faulty-extensions

Check and tell if its working.

I just disabled all (restarted) and checked, issue is still there

Troubleshooting plugins

• https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins

Check and tell if its working.

If I disable everything except Flash I still have the issue, I am unsure how to test if it is Flash that is the problem as most things that I am aware of that use fullscreen on the web are Flash applications, disabling Flash means I disable the applications too.

I have also made sure that it is up to date (Flash)

Solved MY many problems with FF6: Went back to IE9. They seem to have resolved their/mine problems :-)

BTW, anyway I can revert back to Mozilla 5 or whatever I had before the historic update??

Managing the Flash plugin

• https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin

Check and tell if its working.

It was the Flash Hardware Acceleration that was causing the problem.

Thanks heaps for the help over the last coupld of days :)