[thinkingemote]

What is tab queue? Is that the new feature or is that the old feature that gp was complaining about?

What are the new features?

[Vinnl]

It's the feature they were complaining about. It's useful if you're in some other apps (e.g. a feed reader) from which you want to open several links in a row, which you then work through in order afterwards within Firefox.

Disabling the tab queue means tabs get directly opened again.