Examine source code of PreferencePulse

{
  "manifest_version": 3,
  "name": "PreferencePulse",
  "version": "1.0.0",
  "description": "Inspect CSS support coverage for user-preference media features.",
  "icons": {
    "48": "glyph/icon-48.png",
    "96": "glyph/icon-96.png",
    "128": "glyph/icon-128.png"
  },
  "action": {
    "default_title": "PreferencePulse",
    "default_icon": {
      "48": "glyph/icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "bg/router.js"
    ]
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "storage",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ca35f55-f076-461f-9c9a-93d40a2ed184}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}