Since many of you (or at least some) use Avast!, I thought I’d let you know that I just saw this.
In Reddit, Avast Forum and Mozilla ZZine, there are many reports that the latest Avast is deleting FF add-ons, apparently at start up without any option to stop the deletion. It isn’t linked to the Avast’s “Browser Cleanup” tool. The exact cause is at this point unclear. The issues are confirmed by some users but not noticed by others. The only common denominator is that all affected users run the latest Avast on their PC and use Firefox stable.
“It is recommended to backup your Firefox profile just in case. You can use a program like MozBackup for that which is provided as a portable version and installer. All you need to do is run the program, select the version of Firefox that you want to back up (it supports portable installations as well), select the Firefox profile to back up, and then what you want to save to the local system. Make sure that extensions are selected.” – gHacks
So…before you blame Windowblinds…just kidding. Not happy this is happening to you all…if it is.
Source:
http://www.ghacks.net/2014/11/16/latest-avast-reportedly-deleting-firefox-add-ons/?_m=3n%2e0038%2e1431%2ehj0ao01hy5%2e1hby