Coming from old Image Zoom Addon which is not longer working in FF57+, I miss some things here. First of all the right click menu is too interleaved for me, most options I get only at third level. I miss an option to adjust the menu, so that I can put (for example) "Fit to window" directly to the right click menu, next to "Rotate and Zoom Image".

--
Fit to Window
Reset Modifications
Rotate and Zoom Image ->
--

After that, at the second level, I wish to put the most modifications. Because everyone may like it different, an option to adjust the menu like in old Image Zoom is missing :)