Product review images in Flipkart and Amazon are shown in a small frame inside the web page. This extension can show the image in a full screen resolution. Only support Flipkart and Amazon atm, but other sites can be easily added.
screencast.mp4
Download this repo then,
Go to chrome://extensions > Enable developer mode > Load unpack extension > load this repo folder.
Go to about:debugging#/runtime/this-firefox > Load Temporary Add-on... > Load the manifest.json