Examine source code of Zen Internet

{
  "manifest_version": 3,
  "name": "Zen Internet",
  "version": "3.2.0",
  "description": "Immersive, minimal and transparent internet. Learn more at sameerasw.com/zen",
  "browser_specific_settings": {
    "gecko": {
      "id": "{91aa3897-2634-4a8a-9092-279db23a7689}"
    }
  },
  "icons": {
    "48": "assets/images/logo_48.png",
    "96": "assets/images/logo_96.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "webNavigation",
    "alarms"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Zen Internet",
    "default_icon": {
      "48": "assets/images/logo_48.png",
      "96": "assets/images/logo_96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "shared/polyfill.js",
        "content-script.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "background": {
    "service_worker": "background-wrapper.js",
    "scripts": [
      "shared/polyfill.js",
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "theme.css",
        "data-viewer/data-viewer.html",
        "data-viewer/data-viewer.js",
        "data-viewer/data-viewer.css",
        "popup/welcome.css",
        "popup/welcome.js",
        "shared/*",
        "assets/images/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "commands": {
    "toggle-current-site": {
      "suggested_key": {
        "default": "Alt+Shift+U"
      },
      "description": "Toggle Zen Internet for the current website"
    },
    "toggle-global-styling": {
      "suggested_key": {
        "default": "Alt+Shift+G"
      },
      "description": "Toggle Zen Internet global styling"
    },
    "toggle-global-transparency": {
      "suggested_key": {
        "default": "Alt+Shift+O"
      },
      "description": "Toggle Zen Internet global transparency"
    },
    "toggle-fallback-background": {
      "suggested_key": {
        "default": "Alt+Shift+B"
      },
      "description": "Toggle fallback background for the current website"
    }
  }
}