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Are you working on e10s compatibility, Lumox?

Это отзыв для предыдущей версии этого дополнения (1.1.0.3). 

Currently no, not until the Firefox developers have added a lot more functionality to their web extension API's. Without more functionality, Save Images will become virtually useless with most options being removed.
And I am not going to make it e10s compatible and then have to rewrite my addon again to make it into a web extension.