Examine source code of BlockeruBlock

{
  "manifest_version": 2,
  "name": "Simple Ad Blocker",
  "version": "1.0",
  "description": "A basic ad blocker",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6819296-d567-49f9-8a9b-a5b301af3cde}"
    }
  }
}