Examine source code of Sidereal Time Calculator

{
  "manifest_version": 2,
  "name": "Sidereal Time Calculator",
  "version": "1.0",
  "description": "Calculates local sidereal time and provides an alarm based on user-defined sidereal time.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{0ddef242-f06f-41b3-a5b3-b0c1bc43a865}"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "sounds/*.mp3",
    "icons/de.png",
    "icons/en.png"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';"
}