Firefox Download - Firefox Tips

Disable Automatic Image Resizing

Mozilla Firefox will by default resize images as you browse the Web to fit within the browser's viewport. Follow the steps below to disable image resizing in Firefox.

Type (or copy and paste) "about:config" without quotes into the address bar and press enter.
Type (or copy and paste) "browser.enable_automatic_image_resizing" without quotes into the filter bar.
Double click on the browser.enable_automatic_image_resizing listing that appears to set its value to false.