Did you install the 64 bit version in the correct location?

• (64 bit Windows;64 bit Firefox) "C:\Program Files\Mozilla Firefox\"
• (64 bit Windows;32 bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

Make sure there is no Firefox instance running still when you start Firefox. Perhaps you had 32-bit Firefox still running when you tried to start 64-bit (Win64) version.

Sorry for the delay in replying.

Yes to both your questions, cor-el. To James, I might have had the x32 running at the time, I can't recall.

The problem is resolved as of this morning, however. The only thing I did was restart the laptop(instead of just waking it from sleep) and run only the x64 version, and now Firefox shows correctly as x64.

I think James may be right, in that I can't run the two versions at the same time. They will show as whichever version I opened first?

Thanks for your help, and cheers.

Note that you should use separate profiles for each Firefox version to avoid issues with corrupting the profile. See:

• http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_windows
• http://kb.mozillazine.org/Shortcut_to_a_specific_profile

You can add -no-remote to the command line to open another Firefox instance with its own profile and run multiple Firefox instances simultaneously.

• http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile
• https://developer.mozilla.org/Mozilla/Multiple_Firefox_Profiles

I Will check those out, Cor-el.

Thanks.

Note do not use the -no-remote switch with the default Firefox Profile.

The issue was you cannot run two or more instances of Firefox on same Profile.