Examine source code of Container Manager

{
  "manifest_version": 3,
  "name": "Container Manager Pro",
  "version": "1.0.0",
  "description": "A modern, powerful replacement for Firefox Multi-Account Containers with auto-assignment rules, workspaces, favorites, and statistics.",
  "author": "Container Manager Pro",
  "homepage_url": "https://github.com/example/container-manager-pro",
  "browser_specific_settings": {
    "gecko": {
      "id": "container-manager-pro@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "contextualIdentities",
    "tabs",
    "cookies",
    "storage",
    "menus",
    "webNavigation",
    "notifications",
    "sessions",
    "alarms",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_title": "Container Manager Pro"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true,
    "browser_style": false
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+K"
      },
      "description": "Open Container Manager Pro popup"
    },
    "move-current-tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+M"
      },
      "description": "Move current tab to a container"
    },
    "open-favorite-1": {
      "suggested_key": {
        "default": "Ctrl+Shift+1"
      },
      "description": "Open new tab in favorite container #1"
    },
    "open-favorite-2": {
      "suggested_key": {
        "default": "Ctrl+Shift+2"
      },
      "description": "Open new tab in favorite container #2"
    },
    "focus-search": {
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      },
      "description": "Focus the container search box (in popup)"
    }
  }
}