Examine source code of bigavi

{
  "manifest_version": 2,
  "name": "Detailed Zoomed Images",
  "version": "0.1",
  "description": "Loads high-resolution versions of thumbnail images when zoomed in on Twitter.",
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "zoom_imgs.js"
      ]
    }
  ]
}