I love the feature to keep extracting emails as you use IE, however, it doesn't work if the page is loaded dynamically. I think this may be becuase the URL doesn't change. Even forcing a refresh doesn't get Data Extractor to pick up the page changes and extract the emails I can see right in front of me.

Is this a bug or a limitation?

One man's bug is another's limitation, but seriously the application takes in unique URLs, not the dynamic state of the page open in IE. This is the limitation of the software at the moment, but might be something we revisit in a later version.