@CraigB Thanks Craig, I did have a look at Avast faq section but it was not very clear on my particular question,it did comment on synchronisation to other devices but not to other browsers on one computer. It does make sense that Avast passwords needs to be installed on each browser. Thank you for your your help.
@asathorny Thankyou asa, like you I use Chrome as my main browser and occasionally Safari. Thank you for confirming the need to install on each browser.
I was hoping that as Avast Security looks after the Mac and all browsers Avast Passwords would do the same. I guess when thinking about it you guys are correct in stating it needs to be installed on all browsers as Avast Passwords is an extension.