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It will also detect when a webpage you are trying to visit is dead and will offer to replay an archived version
Is this just for personal purposes or would I be contributing to the internet archive?
Purely to contribute to the internet archive. There’s the “save page now” button that’ll save the webpage to your account, but the automatic downloader that I refer to in the post doesn’t do that and is purely for the sake of expanding the archive.