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

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

If disabling hardware acceleration works then check if there is an update available for your graphics display driver.

Hi No still has not solved it. I have disabled all addons. the other thing i have noticed is i cannot open or save any downloads. firefox just locks up and i cant do anything with it. i minimize firefox and restore it and the download has disappeared. same thing happens if i try it again and again

Try deleting downloads.sqlite from the profile. Otherwise you might have to do more extensive troubleshooting.

• http://kb.mozillazine.org/Standard_diagnostic_%28Firefox%29

Thanks but i still have the problem with dropdown boxes. i can see whats it them but cant click on whats in them. when i try it is as if there are not even there that's when firefox locks up

I went through programmes i had installed recently and found "free commander" i uninstalled this and my problem is now solved

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

See Basic Troubleshooting: Make a new profile:

• https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I went through programmes i had installed recently and found "free commander" i uninstalled this and my problem is now solved