My installed add-ons always disappeared after PC restart that I have to install them all over again, is there any solution?

Lately after last upgrade of Fierefox, my add-ons suddenly disappeared, after I turn on my PC. So I have to install them all over again, than everything work fine. But this morning it happened again, my add-ons disappeared. I try to looking for an answer but have no luck.
My add-ons that alwys disappeared after restarting PC, are :
1. Adblock
2. DownThemAll
3. DownThemAll Anti container
I'm not install these add on while I'm asking this question.
Is there any solution for this problem?

Avast software has been reported to cause this problem.
*Avast suddenly doesn't like several Firefox add ons:<br>**https://forum.avast.com/index.php?topic=160289.0<br>**https://forum.avast.com/index.php?topic=160289.msg1152011#msg1152011
*Latest Avast reportedly deleting Firefox add-ons - gHacks Tech News:<br>**http://www.ghacks.net/2014/11/16/latest-avast-reportedly-deleting-firefox-add-ons/

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