I think It was added today in the latest Canary Version 126.96.36.199 (Official build) canary (64-bit), the ability to right click on any images and reverse search for it in Internet. the best thing about this feature is that it respects the user-selected search engine. so when I set Google as my default search engine, it reverse searches for the image in Google, If I set Bing as default engine, it'll use Bing. looks like there is only these 2 engines currently supported for this feature. no support for other engines like Yandex yet, even though they support reverse image search.