This is one of the worst and most poorly executed add-ons I've ever been given the chance to see.
Clicking on the items in the main menu does nothing, one has to right-click and select "entire page" instead, to get it working. After taking the screenshot I am taken to a page to "edit" the screenshot, so I click "Done" to get the bloody image into my computer.
The "save" button does not produce a "save as" dialog as one would expect. IT saves the image... in the cloud? WHY? WHERE? HOW DO I GET A LOCAL FILE FROM THAT?
There is also an option to "download" the image, but that doesn't present a "save as" dialog either. IT pretends to save the image onto your computer, but does not let you know where. After fiddling around you get to open a data:/... URL on your browser, which you can thankfully save. But, alas, it has a bloody banner to the top.
The settings section is also a mess. On first sight, I dismissed the "edit" default action, and chose "download" instead. Poor stupid me. After seing that this doesn't produce a Save As dialog, I wanted the "Edit" mode back, to at least get the image somehow, but THE OPTION WAS NOT THERE ANYMORE.
I will waste no more time to describe this piece of crap. Guys, let go of programming, and do something else. By the way, I program since 2003.