Examine source code of Minimal Reading Mode

{
  "name": "Minimal Reading Mode",
  "short_name": "Reading Mode",
  "version": "1.8.1",
  "description": "Optimize any website for legibility and reading: clear spaced font, nice contrast, zen focus & night dark mode. Simple & lightweight",
  "homepage_url": "https://xaviesteve.com",
  "browser_action": {
    "default_icon": "icon24.png",
    "default_title": "Reading Mode"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a60ad4f2-cfe4-4a3e-98c1-d9c4c6811f15}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "manifest_version": 2,
  "permissions": [
    "activeTab",
    "storage"
  ]
}