Examine source code of Traffic checker

{
  "manifest_version": 2,
  "name": "Traffic checker",
  "description": "A plugin to check the half price of Iranian site traffic",
  "version": "1.0.2",
  "icons": {
    "48": "fire_w_48.png",
    "96": "fire_w_96.png"
  },
  "author": "Kia Hamedi",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "./content_script.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "Traffic checker",
    "default_icon": "fire_w_48.png",
    "default_popup": "popup/index.html"
  },
  "permissions": [
    "storage"
  ]
}