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 :
link text
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Reinstall with Current Release Firefox 57.0.4 with a Full Version Installer
link text
Please let us know if this solved your issue or if need further assistance.
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 :
[https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles link text]
[https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer link text]
Reinstall with Current Release Firefox 57.0.4 with a Full Version Installer
[https://www.mozilla.org/firefox/all/ link text]
Please let us know if this solved your issue or if need further assistance.