I am often digging around obscure websites and regularly run into 404's and even websites with expired domains. This addon helps automate an essential part of my research workflow.

Mr. Kahle this is add-on you designed HAS got to be at least one of your "pride & joys" technologically. I am looking forward to reviewing other add-on(s) that you kindly offer to share.

Thanks for helping me find what I was unable to prior.
MommaWolf

This was my favorite Test Pilot experiment so far. It's very helpful to have an easy way to pull up cached content when a site is down.

When you get a 404 and the page can't be found it looks to see if it can find one. Super hand.

Really buggy since a year ago. Shows the notice e.g. when simply navigation back and forth as others have mentioned.

Works very good and saves a lot of time by showing missing content!