Examine source code of On reddit

{
  "manifest_version": 2,
  "name": "On reddit",
  "version": "0.0.2",
  "description": "Check if the current url was submitted to reddit",
  "icons": {
    "48": "icons/white-48.png"
  },
  "permissions": [
    "*://reddit.com/*",
    "tabs",
    "webRequest"
  ],
  "browser_action": {
    "browser_style": true,
    "default_area": "navbar",
    "default_icon": {
      "16": "icons/white-16.png",
      "32": "icons/white-32.png",
      "64": "icons/white-64.png"
    },
    "default_title": "On reddit?",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}