Examine source code of ShootBoard Web Capture

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.1.0",
  "default_locale": "fr",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-extension@shootboard.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "menus",
    "nativeMessaging",
    "notifications",
    "scripting",
    "storage"
  ],
  "background": {
    "scripts": [
      "nativeProtocol.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.instagram.com/*",
        "https://instagram.com/*",
        "https://500px.com/*",
        "https://*.500px.com/*"
      ],
      "js": [
        "contentScripts/mediaSourceTracker.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  }
}