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

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.

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.

Alt+w conflicts with the "whole word" search in the search panel, setting it's value when I not expect it - would really love to have the shortcut configurable or to be assigned to something different.

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

大量のタブを閉じる際に右クリックメニュー → 右から閉じる、ができていたあのに新しいFirefoxになってから、間に「複数のタブを閉じる」が入っていちいち邪魔。タブなんて閉じたり開いたりを繰り返すんだからなんたってそんな仕様変更したのか。このアドオンは右クリックすらなく左手一本ショートカット一発で閉じてくれる。こういうの本当に嬉しい

This add-on is just what is needed, especially since Firefox developers have decided to bury the "close tabs to the right" into a nested context menu item (at least on Nightly) More clicks to perform a simple task.

Thanks to the developer of this addon ! I can now close other tabs with a simple / customizable keystroke. VERY useful!