Examine source code of Foxpusher

{
  "manifest_version": 2,
  "name": "Foxpusher",
  "version": "1.0.2resigned1",
  "description": "Beam tabs and links to your phone via Simplepush",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "settings/settings.html"
  },
  "icons": {
    "48": "icons/phone-48.png",
    "64": "icons/phone-64.png",
    "128": "icons/phone-128.png",
    "256": "icons/phone-256.png",
    "512": "icons/phone-512.png"
  },
  "browser_action": {
    "default_title": "Push to device",
    "default_icon": {
      "16": "icons/phone-16.png",
      "32": "icons/phone-32.png",
      "48": "icons/phone-48.png",
      "64": "icons/phone-64.png",
      "128": "icons/phone-128.png",
      "256": "icons/phone-256.png",
      "512": "icons/phone-512.png"
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "https://api.simplepush.io/send"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c35db81-7d64-4216-a8eb-58a0e653307e}"
    }
  }
}