It should be able to if you select the option "Rotate page".



Did you refresh the page when you installed the addon?
This extension does not work on privileged sites such as addons.mozilla.org due to a restriction in firefox.

I updated the extension, it should refresh the page when needed. Hopefully it will work better for you. Otherwise just let me now.


I will try to look into this as soon as possible, although I am quite busy with the holidays coming up and a full-time job. If you are using Windows, I would suggest rotating the entire display. "ctrl-alt " (up, down, left, right), or going to display settings and setting the display orientation if the keyboard shortcut doesn't work. Or maybe use the addon "Rotate and Zoom Image" or any other similar extension available here on AMO.