this is a great extension. i've been using it since firefox jumped to quantum. the extension has an options page, which even for the smallest extension makes me happy. you have a number of reverse image searches to choose from and you can even control how the new tab is opened. i highly recommend it if you do a lot of image searches. recently however, it hasn't been working. any time i try to search for an image it redirects me to a google 404 page that says:

" The requested URL /searchbyimage was not found on this server. That’s all we know. "

all hiccups aside. get. this. extension.