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manifest.json
{
  "manifest_version": 2,
  "name": "9gag_video_controls",
  "version": "1.0",
  "description": "Always shows the video controls on 9gag.com.",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.9gag.com/*"
      ],
      "js": [
        "show_control.js"
      ]
    }
  ]
}