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Firefox is automatically reverting to a previous version after I log off.

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I have updated to the latest version of Firefox (57.0.2). It all works fine, until I close Firefox. When I reopen Firefox, I find that it has automatically reverted to version 54.0. How can I prevent this from happening?

I have updated to the latest version of Firefox (57.0.2). It all works fine, until I close Firefox. When I reopen Firefox, I find that it has automatically reverted to version 54.0. How can I prevent this from happening?

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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. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) 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 :

Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer

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

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Thank you, Pkshadow, your instructions worked. I appreciate the assistance.

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Great. Please mark that as a Solution so that others can find the answer. Enjoy.