Not sure if another FP,please see atachment.
https://s9.postimg.org/enu6ch4hr/Capture.jpg
free upload image
It is not a false positive as avast just says that the add-on is not much used amongst avast users.
Not surprisingly since it is a real new one.
https://forum.avast.com/index.php?topic=192094.msg1344186#msg1344186
Thanks Eddy for the quick reply,will ignore as others have the same issue,must be some recent update from Firefox.
When this message comes I was in middle of something and I just hit the remove button accidentally without much thinking. So how to get it back? Reinstalling FF would fix it?
A new install of FireFox should fix it indeed as it is part of FireFox.
If not, there is a bug in the FireFox installer.
As it is very clear these add-ons are new ones and are part of FireFox it is (or at least should be) safe to tell avast to ignore them.