Addons will not stay installed

So I recently updated from Mozilla 14 to Mozilla 25, imported stuff from other Web Browser. SO I saw Adblocker and lightbeam..... Installed, both worked. So I close down Mozilla, come back a few hours later and I see my addons are not installed........... I try re-installing them then shutting down Mozilla..... it WILL NOT STAY INSTALLED!!

Hello,
Please see the support article here:
[[How to fix preferences that won't save]]
The easiest fix will probably be to do a Firefox Reset as the article suggests.
I hope this helps. Let me know if not.

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