Examine source code of Extract Media Link

{
  "manifest_version": 2,
  "name": "Extract Media Link",
  "version": "1.2",
  "description": "Extension creates input section with direct link to video or image file. Easy to read, easy to copy and share",
  "icons": {
    "16": "icons/pngegg-16x16.png",
    "24": "icons/pngegg-24x24.png",
    "32": "icons/pngegg-32x32.png",
    "64": "icons/pngegg-64x64.png",
    "128": "icons/pngegg-128x128.png",
    "256": "icons/pngegg-256x256.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.9gag.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9631e04-9742-4e9f-b6cb-281d4e4ce8ac}"
    }
  }
}