Hit and miss Rated 1 out of 5 stars

There is no documentation so writing a script is near-impossible for many sites. That is why there are thousands of scripts that do not work or that seriously impede performance. It will only get messier without documentation. I gave up trying to deal with events and dynamic content. Regular JavaScript often does not work and it is impossible to find out why. A very tedious way to waste time.

This review is for a previous version of the add-on (1.9). 

Documentation absolutely exists, as a community-supported wiki:

http://wiki.greasespot.net/