Examine source code of sipgate App Cick2Dial

{
  "manifest_version": 2,
  "name": "__MSG_appNameSipgate__",
  "description": "__MSG_appDescriptionSipgate__",
  "version": "3.1.6",
  "short_name": "sipgate",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "default_locale": "de",
  "homepage_url": "https://www.sipgate.de/",
  "externally_connectable": {
    "matches": [
      "*://*.sipgate.com/*",
      "*://*.sipgate.de/*",
      "*://*.clinq.com/*",
      "*://*.clinq.app/*"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [
    "/*",
    "html/*"
  ],
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs",
    "*://*.sipgate.de/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "chrome-webstore@sipgate.de",
      "strict_min_version": "109.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_title": "__MSG_appNameSipgate__"
  }
}