Examine source code of KiXVoIP Browser Calls

{
  "manifest_version": 2,
  "name": "KiXVoIP Browser Calls",
  "version": "1.1.25",
  "description": "Converts telephone numbers into links that can be clicked to place a call using the VoIP callback service.",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png",
    "256": "icon256.png"
  },
  "options_ui": {
    "page": "Options.html"
  },
  "background": {
    "scripts": [
      "PlaceCall.js"
    ]
  },
  "permissions": [
    "storage",
    "notifications",
    "contextMenus",
    "tabs",
    "https://*.0rganize1nfo.eu/"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "VoIPLinks.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "@voipbrowsercalls"
    }
  },
  "homepage_url": "https://1.0rganize1nfo.eu/firefox"
}