Is there sb can give the answer?
This has been covered many time and a forums search will reveal this.
The whole point of SSL, secure encrypted email is to keep out prying eyes, including AVs. Without a third party interface (STunnel) you can’t scan SSL content.
Gmail and Avast Providers
Solution: Using GMail with Avast and a SPAM filter
Redirecting multiple SSL accounts
avast! supports firefox, it is my default browser of choice.
If however, you are talking about viewing you Gmail emails using your browser, that too uses a secure connection (https) which can’t be monitored directly. avast’s Web Shield monitors http traffic for infection.
Thank you very much!
Feel free to come back if you need extra help setting up Stunnel + avast + Gmail 
No problem, welcome to the forums.
Stick around and browse the forums, especially the sticky topics at the top of each of the forums. They provide a wealth of information to help you get the best from avast.
OK!I C.
The best habit before asking questions is a first look into the TOP SUBJECT of the forum.
THANKS!I GOT IT.