I know there are, but they aren't open source, except for [Search by Image](https://github.com/dessant/search-by-image) (just speculation, haven't researched far enough). The main functionality I seek is that of having similar images displayed while looking at the one selected
It seems that Trace is discontinued for now, at least on Firefox.
Also, isn’t the use of many extensions actually harmful to you, as in fingerprinting? they’re Interesting extensions nonetheless