Examine source code of Voterr

{
  "version": "0.0.3",
  "name": "Voterr",
  "description": "Adds the ability to like/dislike and comment on any page on the internet.",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    },
    "default_title": "Voterr",
    "default_popup": "popup/popup.html"
  },
  "options_page": "popup/popup.html",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "sidebar/sidebar.html",
    "badge/badge.html"
  ],
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@voter.io"
    }
  }
}