The good: if it works, it works. It's an amazing tool to save webpages and look them up if necessary.
The bad: the 404 page has always come up too soon but lately (1-2 weeks ago) webpages cannot be saved. The error message: job failed. No one can do anything with that information.. saving a page directly from the website works but if I cannot save a webpage with this Addon why should I keep it?
