Thank you for the feedback on image search -- tineye is something we've considered, though haven't implemented yet.
Right now the DDG plugin doesn't work on Firefox for Android, it just says "we don't filter special pages" or somesuch, probably because it tries to filter its own tab? (Firefox Android pops up extensions in separate tabs)
btw I just tried image search again after being scared off a while ago because it was buggy, and it's in a much better state than it was back then!
Love how you guys show you don't have to sell out to be able to thrive, and that caring for freedom shouldn't come at the cost of design or functionality (quite the opposite!)
<3