Examine source code of Grouped — Tab Group Manager

{
  "manifest_version": 2,
  "name": "Grouped — Tab Group Manager",
  "version": "1.0.2",
  "description": "Safari-style tab groups for Firefox. Organize your tabs into named groups and switch between them — inactive groups are fully unloaded from memory, so only the tabs you're using right now are ever open.",
  "author": "DeveloperAnonymous",
  "browser_specific_settings": {
    "gecko": {
      "id": "grouped-tab-group-manager@developeranonymous",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "sessions"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "Grouped — Tab Group Manager"
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "commands": {
    "group-next": {
      "suggested_key": {
        "default": "Ctrl+Alt+Down"
      },
      "description": "Switch to next group"
    },
    "group-prev": {
      "suggested_key": {
        "default": "Ctrl+Alt+Up"
      },
      "description": "Switch to previous group"
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "icons": {
    "48": "icons/icon48.svg"
  }
}