I like the idea of Avast Secure Browser, but i hate that it won’t let me install LastPass password manager as an extension.
We’ve used LastPass for years on several PCs and laptops at home and never had a problem. What a shame we must entrust all our passwords to a second entity, namely Avast.
No problems here using LastPass Extension on latest ASB
Upper right hand corner. (screenshot) 
Where do you go to get the lastpass extension for the Avast browser? The lastpass website does not list support for Avast.
The Chrome extension should work with Avast Secure Browser.
July 2021 and LastPass won’t show on Avast for me, either. Windows 10.
There are plenty of other browsers, so I am uninstalling because this issue seems to be permanent.
https://d1ka0itfguscri.cloudfront.net/Lh/2021/07/27/18/30/critFvViH2X/preview.jpg
Make sure it’s selected in the PW extension.
(Security and Privacy Center)
https://d1ka0itfguscri.cloudfront.net/Lh/2021/07/27/18/33/critFyViH2A/preview.jpg