It has a good interface, and it's easy to use, but there's some buggy shit in there. Trying to find their support page is an exercise in frustration, which cost them 2 stars.

Until today, this was one of my most used extensions! For some unknown reason it is not working today... I have no idea as to why⁉

Firefox displays XML files as blank pages,
and I couldn't fix this problem until I disabled your addon.