HI, please always :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

You can try a reinstall over top : Reinstall with Current Release Firefox 59.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please update your Flash 27 Flash Player Version: 29.0.0.113 Current Version https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, . . . .) Note: Other software is offered in the download. <Windows Only> Please let us know if this solved your issue or if need further assistance.

What security software do you have?

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

I tried pkshadow's advice and then rebooted. It still says 59.0.2. So far so good.

Thanks

buchster257 said

I tried pkshadow's advice and then rebooted. It still says 59.0.2. So far so good. Thanks

Welcome, I have had the issue myself at times and have had to do it several updates until it finally did it it self. As cor-el mentioned security software can stop a update so keep it updated.

So if this fixed the Issue Please Mark the Answer that worked as the Solution so other may find it. Thanks.