Absolutely fantastic Add-On! Rated 5 out of 5 stars
You can change simple texts and links or do bigger things like changing whole formats or filter/add things.
The fact that you can change also the source code of a site in many passes, especially with the possibility of regular expressions makes this Add-On very very powerful. You can recreate a site as you wish: Change time- or date formats, highlight, or change the order of things. Everything is possible.
A must-have if you wanna save a lot of time and work.