Archive.org has an extension that automatically downloads web pages you visit

https://chrome.google.com/webstore/detail/wayback-machine/fpnmgdkabkmnadcjpehmlllkndpkmiak

https://addons.mozilla.org/en-CA/firefox/addon/wayback-machine_new/

It will also detect when a webpage you are trying to visit is dead and will offer to replay an archived version