Rated 5 out of 5 stars

It’s almost perfect.

There is only one very minor but very irritating issue: the context menu item gets inserted at the top on my browser, throwing off the position of everything else in the context menu, which is killing my muscle memory. I suggest making the context menu item insertafter="context-viewpartialsource-selection" instead of "context-stop" – I think that’s the most logical position.

This review is for a previous version of the add-on (0.1.1-signed).