Here are some screenshots of it

Please uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer https://www.mozilla.org/firefox/all/

Please keep Video Card Drivers Updated, very important. Thank You

Please let us know if this solved your issue or if need further assistance.

No joy. Still showing up as an old version. Tried it a few times.

So I hit the "Refresh Firefox" button that pops up when you first install. That seemed to have fixed the issue. Thanks for your help.

tehduffman said

After updating to quantum (57) i now get alerts from many websites that my browser in unsupported and I need to update. On the Firefox plugin page I cannot install anything because my browser appears as version 42. Other browser info sites also show my browser as version 42. Hell even the educated guess in this support form shows me as version 42.

You useragent was modified as you can see on the end.

See this article on how to reset your useragent to default. https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox

tehduffman said

So I hit the "Refresh Firefox" button that pops up when you first install. That seemed to have fixed the issue. Thanks for your help.

The so called Refresh only worked because you basically made a new Profile instead of just resetting the useragent.

You can see what the Refresh does in bottom half of https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings