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It will also detect when a webpage you are trying to visit is dead and will offer to replay an archived version
I believe the automatic archiving has to be manually enabled by going to the settings, selecting the general tab and enabling "Auto save page".
My desire to help archive.org preserve the Internet is conflicting with my desire not to have anybody tracking my browsing habits.
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