22.2.6001 (build 22.2.6962.528) fixed the AvastUI startup problem (W7 defense issue?), but the "Network Protocol Error" with Firefox 97.0 and 97.0.1 appears worse on many HTTPS sites. Turning off HTTPS scanning "fixes" it.
Also, there's still the broken serial/COM port OS scanning at boot. See ticket 11394513 from almost two years ago. It appears Avast allows the port to be briefly opened during the scan, but doesn't allow any data transfer to/from the external devices.