Examine source code of Imgur hi-resify

{
  "description": "A script made to redirect from i.imgur.com/pictureName_d.jpg* to i.imgur.com/pictureName.jpg.",
  "manifest_version": 2,
  "name": "Imgur hi-resify",
  "version": "1.0",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hiresify@nonsense.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://i.imgur.com/*_d.jpg*"
      ],
      "js": [
        "hires.js"
      ]
    }
  ]
}