All (nearly) add-ons / extensions disappear after update to v15 then v16

This has happened to me twice now. After a FF update (first to v15?) all or most add-ons / extensions disappeared, didn't even appear in the menus. (At least I am sure my critical extensions (see below) were missing earlier. It has been awhile.) After trying the solutions posted in various topics I finally gave up and created a new profile. I installed my more critical add-ons, Firebug, Flash Firebug and Restartless restart. Everything was fine until the latest update to 16.0.1. Once again all add-ons disappear, including from the menus. Curiously "clear recent history" also seems to have been missing until I deleted the extension and compatibility files.
Going back to my previous profile, after deleting the extension and compatibility files and reloading FF I see that some add-ons now appear but not my critical ones.

@cor-el,
So... With FF closed I deleted localstore.rdf, compatibility.ini, extenstions.* and addons.* files. Start FF, the files rebuild. No extensions appear so no change.
As a test I created a new profile and added extensions and of course, everything worked fine. Then I got slightly smart and restored the entire profile (and just that profile) from a backed up version before the FF update. Everything works again!
Conclusion: Something in the FF update process corrupted something other than the files we discussed above causing (nearly?) all add-ons to not work. So far it appears that whatever the update changed in the profile was not needed as restoring an older profile version seems to work fine.

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All (nearly) add-ons / extensions disappear after update to v15 then v16

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