This morning you red flagged FB Purity v16.1.0, and recommended it was disabled, when I checked the reason you said it was because of it’s low, 1 star, user rating.
The user rating for FB Purity is, in fact, 5 stars. Nowhere is it rated 1 star.
Fluff Busting ( FB ) Purity The avast browser cleanup tool is a "POS" it is extremely badly thought out and badly designed and throws up many false positive results, such as in this case. I do like Avast AV and use it myself, but I personally turn off the browser clean up tool, as it is rubbish.
Please use the right forum for complainings about Browser Cleanup.
In general, Browser CleanUp fights actually against more than 80.000.000 bad toolbars and extensions. In this case it’s possible to get an false positive for some addons. But we try to minimize the FPall the time and if you find any FP, please report to us.