You could and should trust avast.
Remember also that cybercriminals now also are manipulating search-engine results,
so one will land at a fraudulous site or users, that download an extension outside checked reliable sources.
I mentioned also certification abuse recently, where pre-cert chains are being abused by malcreants.
So when visiting a bank etc. Do not go there directly from a search-engine result link, it could be a fraud scheme. So check before you leap. Forewarned is forearmed.
polonus