Rated 5 out of 5 stars

le TurboLion ar DFómh. 21, 2017 · buan-nasc

Was using this extension for years, but seems like it won't be updated for Firefox 57. Thankfully, there's a newer one which seems to do the trick: "Rotate and Zoom Image"

https://addons.mozilla.org/en-US/firefox/addon/rotate-and-zoom-image/