I feel I need to give a 5-star rating to counteract the sole 1-star review below. This extension works fine for me. There's an online education site that I use that prevents right-clicking on images. When I click the toolbar icon for this extension, I can right-click images to get the usual context menu. So no problems here.

But what I would like to see is a whitelist feature so that I don't need to click the icon for every single page I visit. Can this be added to an options page please?

UPDATE: Thanks for adding the whitelisting feature in version 0.1.6! Unfortunately, it doesn't actually work on the site I installed this extension for. If you want to investigate further, I'd be happy to give you more details privately as I'll need to send you my login details to the site.