Examine source code of Block the Ad!

{
  "manifest_version": 2,
  "name": "Block the Ad!",
  "version": "1.0",
  "description": "Block annoying ads on web pages",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0f45091-2e03-4ff1-92f0-a94209324d0e}"
    }
  }
}