Correct, this extension does not perform a reverse image search (I should clarify that in the addon's description).

The goal of this addon is to find larger images that the _website_ provides, many of which are otherwise inaccessible (i.e. the website doesn't link to the larger images, even though they exist). The addon isn't meant to replace a reverse image search engine, but rather to be used as a tool in conjunction with one, since the images linked by a reverse image search often aren't as large as they could be.

To address your specific situation, if you were to try to view album art on a blog, this addon would probably not yield a much larger image, unless the blog author uploaded a larger image to their blog (and linked a scaled-down one).

However, if you were to go on the iTunes website and use the addon on album art there, you'd likely find a much larger image than what's on the website, because iTunes does store very high-definition images on their server (which aren't by default available on their website).

I hope this answers your question. If not, please let me know :) (you can use the Github issue tracker or Discord)