I installed yesterday opensuse tumbleweed with kernel 4.6.2-1.
I wanted to install some gnome 3 extensions, but no installation is possible.

here is how I proceeded; I :
- launched firefox (v47)
- connected to https://extensions.gnome.org
- selected an interesting extension
- turned on the button
- at this time, the screen became dark (sometimes the session is closed automatically), and after a few seconds the desktop appeared again, but the "installed extensions" tab indicates me no extension was installed. moreover, when I refresh the page of the extension, the button is "off".

I disabled the popup blocker but it changed nothing.

on other browsers (chrome, opera) I even have no on/off button...