Rated 5 out of 5 stars

Great but how can I replace ajax-loaded contents?

This review is for a previous version of the add-on (0.16.0.1-signed). 

Starting with this version (0.16.0) there's a new option that allows you to apply a substitution list periodically. You can try to apply it every second (or the period you consider necessary) and see if it fits your necessity.