Looking for more options and tools when it comes to viewing pictures from within Firefox? The very obviously named Image Tools add-on for Firefox will give you a few more basic controls when it comes to viewing images from within the browser.
This add-on adds a toolbar across the bottom of the screen when you are viewing stand alone images inside of Firefox. In the toolbar, you can fit the image to the window size you are viewing, zoom into the image, zoom away from the image, save the image or rotate the image around.
The author has also mentioned on his Firefox profile for the add-on that if you have any ideas for the add-on and how to make it better, let him know. I always like to see Firefox add-on authors that are open to ideas from the public.
You can pick up the Image Tools add-on for Firefox from the Firefox Add-ons website.