Examine source code of Gotify Push

{
  "manifest_version": 2,
  "name": "Gotify Push",
  "description": "A Simple Firefox Extension For Sending and Receiving Messages from Gotify Push Notification Server.",
  "version": "0.1",
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icon_16.png",
    "default_popup": "pop.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/gotify.js",
        "js/app.js",
        "js/background.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "contextMenus",
    "<all_urls>",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gotify@sanweb.com"
    }
  },
  "short_name": "Gotify Push",
  "homepage_url": "https://gotify.net"
}