Examine source code of SpeedRead

{
  "manifest_version": 3,
  "name": "SpeedRead",
  "version": "1.6.1",
  "description": "Speed-read the current page: extracts article content (like reader mode) and opens the SpeedRead one-word reader with fullscreen support.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "SpeedRead this page (pin from the puzzle menu if the icon is not on the toolbar)",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "96": "icons/icon96.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "SpeedRead this page"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "speedread@hromp.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; style-src 'self' https://fonts.googleapis.com; font-src https://fonts.gstatic.com;"
  }
}