Examine source code of redditcheck

{
  "description": "Links to all reddit submissions of the current page.",
  "manifest_version": 2,
  "name": "redditcheck",
  "version": "0.3",
  "permissions": [
    "activeTab",
    "tabs",
    "https://reddit.com/*"
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "redditcheck",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "48": "icons/redditcheck_icon_plain.svg",
    "96": "icons/redditcheck_icon_plain.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a9fa7426-2b83-4902-9db9-6baaad75b56f}"
    }
  }
}