Those keybindings work on MacOS for me, but not on Linux (by default).
There is a way to enable Emacs keybindings in all GTK apps on Linux, but it’s quite buggy in practice (many apps define keybindings that override or conflict with these), and I believe the feature is officially deprecated.
There is a way to enable Emacs keybindings in all GTK apps on Linux, but it’s quite buggy in practice (many apps define keybindings that override or conflict with these), and I believe the feature is officially deprecated.