Examine source code of Looper

{
  "manifest_version": 2,
  "name": "Looper",
  "version": "1.3",
  "description": "Loops a Video from point A to point B continuously ",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "48": "icons/Looper_AB.png"
  },
  "browser_action": {
    "default_icon": "icons/Looper_Static.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7588134-1c6a-49a2-b3e5-6962801f25ab}"
    }
  }
}