Sidebar Tabs

Emulate tabs in sidebar and display tabs vertically. In addition, group tabs and collapse / expand them.
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manifest.json
{
  "action": {
    "default_icon": "img/icon.svg#current",
    "default_title": "__MSG_extensionName__"
  },
  "background": {
    "scripts": [
      "mjs/background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sidebarTabs@asamuzak.jp",
      "strict_min_version": "115.0"
    }
  },
  "commands": {
    "toggleOpenCloseState": {
      "description": "__MSG_toggleOpenCloseState__"
    }
  },
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/asamuzaK/sidebarTabs",
  "icons": {
    "16": "img/icon.svg#current",
    "32": "img/icon.svg#current",
    "64": "img/icon.svg"
  },
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "optional_permissions": [
    "browserSettings"
  ],
  "options_ui": {
    "open_in_tab": true,
    "page": "html/options.html"
  },
  "permissions": [
    "activeTab",
    "bookmarks",
    "contextualIdentities",
    "cookies",
    "management",
    "menus",
    "menus.overrideContext",
    "search",
    "sessions",
    "storage",
    "tabs",
    "theme"
  ],
  "short_name": "__MSG_extensionShortName__",
  "sidebar_action": {
    "default_icon": "img/icon.svg#current",
    "default_panel": "html/sidebar.html",
    "default_title": "__MSG_extensionShortName__"
  },
  "version": "16.0.2"
}