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Windows 10 update 3201845 removes extensions
After Windows 10 applied update KB3201845, Firefox had a new profile which did not include any extensions, and customised options were lost. Bookmarks and history remained. The old profile directory still existed, but was almost empty.
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I called for more help. I found these links;
Cumulative Update for Windows 10 Version 1607: November https://support.microsoft.com/en-us/kb/3201845
News about Windows 10 Update 3201845 https://www.bing.com/news/search?q=Windows+10+Update+3201845&qpvt=Windows+10+update+3201845&FORM=EWRE
Windows 10 Update KB3201845 (DHCP issues) - gHacks Tech https://www.ghacks.net/2016/12/10/windows-10-update-kb3201845/