I've tried this out with a few pages and the add-on doesn't seem to work properly. Even after clicking on the button the extension adds to your toolbar, I don't see the archive.org version of the page.
Very useful, but I'd like the following two features: - Sometimes, the 404 error may not be as obvious so the plugin may not recognise it. Like this: http://physics.stackexchange.com/questions/12784/fractals-in-physics-suggest-book-titles So it would be good to have a little button (which can be added through an option may be) that allows one to see the archives of any webpage. - An option to add a button that actually archives the current page (which isn't deleted *yet*) by going to web.archive.org/save/URLOFCURRENTPAGE
It may be nice to have a single button with two options, "See archives for current webpage" and "Archive current webpage" which appear on all webpages. And then I'll give you 5 stars : )
It may also be a good idea to make the button a bit prettier than the existing button (which does nothing, actually).
Ok, this is my favourite addon. Because it is so small yet has been so useful to me so often in the past. Even when it doesn't detect a 404 (i suppose because the site's code isn't standard) I use the context menu. Thanks for this one!
unimpressed with the functionality of this add on. I still encountered many 404 Page error on pages. frustrating when something that says it does and doesn't. This add on was part of my computer crashing. Up to you to decide.
interesting... i didn't receive a complaint from anyone else, and there were more than 60,000 downloads. maybe something else was crashing your computer...
also in regards to 'I still encountered many 404 Page error on pages. frustrating when something that says it does and doesn't.', you obviously didn't read description and when exceptions occur if you were expecting it to find every missing page...
UPDATE: i now see that in Firefox3.0 on GNU Linux, 'whitelist' option doesn't work if permission of 'whitelist.txt' file is not set properly -- just change permission and it will work.
The archive.org button works as expected on pages that are down or have a different page not found message, and the page automatically loads an archived version of the page when '404 - Page Not Found' is in the title. All in all, a simple extension that does what it says.
However, I find it funny that visiting the extension page AMO triggers the loading of a page from archive.org due to the extension's name. Consider changing the name, as it's very distracting. If possible, make the automatic loading an option you can turn off, with possibly a whitelist so that false positives won't be loaded again. Thanks!