Rated 5 out of 5 stars
Great idea for an add-on; it should simplify dealing with broken websites. It would be helpful if you could incorporate a couple of features from Resurrect Pages (https://addons.mozilla.org/en-US/firefox/addon/2570):
- More cache websites
- Access to ErrorZilla from any page via the context menu (in case of non-standard error pages or any other time someone might want access to these features).