As others already mentioned there's a bug where it thinks the page failed to load when it didn't. If you just provide the option to disable this auto detection it would be great.

As others have written, on recent Nightly versions there are many false positives where it thinks the page isn't available but it is.

Unconfigurable, which gets annoying if one doesn't want to automatically (or always) see the archived version.

Lately it seems way too quick to jump to a wayback lookup when clicking the 'back' arrow button on Firefox. I'm just jumping back to a page that I had just looked at! It isn't 404!

This is a great add-on but sometimes it shows a 'Page not available?' when the page is actually available and after installing an add-on that suspend tabs the issue got worse.

I wish this had an option to disable the auto detection or at least make it less intrusive, right now the 'offering to show archived version...' basically replaces the whole web page before you do anything.

it saved my exam, it saved my degree i love this and i hope it will last.
i thank for the internet archive with all my heart, awsomness

Extremely interesting and informative website. Many thanks.

Works sometimes, but is extremely irritating as this often opens for no reason, randomly. All features in the extension that are manual work perfectly, but the "down detection" is terrible.

I used to love this addon but lately it's kicking in simply when going back and forth in a single tab's history when the page I'm going to has displayed beautifully within the last two minutes. Now I only enable it when I need it, which is a royal pain.

Like everyone else has mentioned, the add on is a little over zealous to show archived versions of the page. Other than that it is a useful add on