This extension is crucial, & everyone would use it, if only it had a graphical icon in the toolbar.
...
That's Disappointing...too bad...

A must have for a smooth browser experience in firefox.

For other mac users: You can find the default shortcuts in the firefox add-ons manager after installation and you can even change these shortcuts there.

新しくなったFirefoxで複数のタブを一気に消すのにアクションが増え面倒くさくなった。このアドオンもデフォルトだと3キー（shift+ctrl＋F1 or F2）の同時推しなのでちょっと面倒。これを2キーで出きる設定にしたので使いやすくなった。

（キー変更方法）
ツール → アドオンとテーマ → 『拡張機能の管理』の右上の歯車『⚙』 → 拡張機能のショートカットキーの管理

私はctrl＋F1（左側全閉じ）、ctrl＋F2（右側全閉じ)にしました。

My most heavily used shortcuts, can't live without.

Must have since the time Firefox hid the option 'Close all tabs besides this one' below a submenu.
Nice that you can set the shortcut keys yourself. I personally use Ctrl+F12 to close all tabs right of the current one and Ctrl+F11 to close all tabs but the current one.

非常好用，666！
Amazing！

Quite easy extension, source code seems legit. Many thanks

Wish we could modify shortcuts or see existing ones from this extension of right-click menu.

I reviewed the extension source code and it's a simple extension that works and doesn't do anything it shouldn't.

It's a must-have. These shortcuts really lack in Firefox. Although, the capacity to edit shortcuts is simply lacking in Firefox.

فاشىنس سخخخ ةعؤا

So simple, yet makes such a huge difference. Thank you for making this!