ブックマークを追加すると、追加したサイトが別ウインドウで開いてしまいます。仕様でしょうか？

Please - add ability to change F2 hotkey to user defined hotkey. Developing in cloud IDE need that hotkey for their options.

It would be great add-on if i could use history sidebar instead bookmarks. Add this option please. Thank you.

There are some Firefox limitations that prevent this add-on from functioning fully, but with what is available it is a lovely experience.