Examine source code of HideMyFbFeed

{
  "manifest_version": 2,
  "name": "HideMyFbFeed",
  "version": "1.1resigned1",
  "description": "Hides your facebook timeline",
  "homepage_url": "https://github.com/adrienbrunet/hidemyfbfeed",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "hidemyfbfeed.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4581adc1-3989-4962-808b-143b0c3aee33}"
    }
  }
}