Vivaldi has a similar feature, which is also easy to invoke by accident on a PinePhone.

BUT at least Vivaldi provides a good sized button on the status bar* at the bottom of the window that allows you to manage the currently tiled tabs.👍

*remember the old full-width-always-displayed status bar that Firefox used to have before the UI vandals set to work? Replaced with the very distracting status thing that bobs up and down all the time?

#vivaldi #firefox #splitview #tabtiling #grumpygit