Comment 2 for bug 1477216

We have generally avoided installing gnome-shell extensions by default, with the exception of the official upstream ones [1]. Extensions are problematic due to their lack of consistent maintenance, while a few are well maintained, some take a long time to get updated to new shell versions, and others just get abandoned. If the latter happens and we have them installed by default we are pretty much stuck maintaining them ourselves.

[1] https://git.gnome.org/browse/gnome-shell-extensions