Image Search Options is an add-on for Firefox that lets you right-click an image to search for it on Google as well as other image search sites. Also available as a Chrome extension.

- Firefox: https://addons.mozilla.org/firefox/addon/image-search-option...

- Chrome: https://chrome.google.com/webstore/detail/image-search-optio...

- Website: https://saucenao.com/tools/