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Stopped working recently - no context menu item shows up for images.Since the "Add to Firefox" button was active here, I clicked it and it installed again without any mention of it being already installed. For a second the context menu activated. And then disappeared again.So I clicked the Add-to button here again, and the context menu works again, briefly.Seems to be self-destructing somehow, although it remains visible in the Add-Ons window.
Re: version - always the latest. Somehow the problem disappeared by itself. Firefox has a life of its own and its good and bad days.
Which version of Firefox are you on? (You can email me via the contact the dev option.) I can't seem to reproduce this issue.