Opera plugin reinstalling itself?

Ok 2nd time this happened >:( I have the opera webrep plugin installed by the webrep for firefox is installed… how in the world is the opera one getting install even though i had it uninstalled?

On a browser i use as a backup one i guess it would be ok to have the webrep installed but still doesn’t tell why did avast reinstall the plugin in opera without me telling it to :-\