I followed Avast's steps for reintegration "Open Avast Premium Security and go to > Menu > Settings > General > Troubleshooting > ADD / MODIFY COMPONENTS > Passwords (old) Make sure that it is enabled (ticked) and then restart the computer" which hasn't affected any changes. So I have to look here for support because it was this update that killed the add on.

HTTPS everywhere was blocking the reintegration link. Turning it off for the link allowed it to reintegrate.