Rated 5 out of 5 stars

Excellent add-on, excellent idea. The execution could be slightly improved, but it is on the right track.

I would love to see a feature to log-in to a page before checking for diffs. For example, log-in to a newspaper site which requires to have an account, or log-in to a webmail page.

This review is for a previous version of the add-on (0.11.1).