Examine source code of Just Read It - Focus Reader & Read Aloud

{
  "manifest_version" : 3 ,
  "name" : "Just Read It - Focus Reader & Read Aloud",
  "description" : "Stay focused with sentence highlighting, listen to articles aloud, and pick up where you left off.",
  "version" : "0.3.4",
  "short_name" : "Just Read It",
  "icons" : {
    "16" : "/icons/just-read-it-16.png",
    "32" : "/icons/just-read-it-32.png",
    "48" : "/icons/just-read-it-48.png",
    "96" : "/icons/just-read-it-96.png",
    "128" : "/icons/just-read-it-128.png"
  },
  "permissions" : [
    "activeTab" ,
    "storage" ,
    "scripting" ,
    "contextMenus" ,
    "clipboardWrite" 
  ],
  "optional_host_permissions" : [
    "http://*/*" ,
    "https://*/*" 
  ],
  "web_accessible_resources" : [
    {
      "resources" : [
        "icons/*" 
      ],
      "matches" : [
        "http://*/*" ,
        "https://*/*" 
      ]
    }
  ],
  "commands" : {
    "activate-reading": {
      "suggested_key": {
        "default": "Alt+Shift+L",
        "mac": "Command+Shift+L"
      },
      "description" : "Enable Just Read It on the current page"
    }
  },
  "action" : {
    "default_icon" : {
      "16" : "/icons/just-read-it-16.png",
      "32" : "/icons/just-read-it-32.png"
    },
    "default_title" : "Just Read It",
    "default_popup" : "popup.html"
  },
  "options_ui" : {
    "page": "/home.html" ,
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "just-read-it@local",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  }
}