Window Manager with Firefox-only Session

[DaGodFuddah]

I added a session in my gdm sessions, where only Firefox is running. What I would like now, though, is to have a window manager running as well.

Here's the script for the Firefox-only session:


[Desktop Entry]
Encoding=UTF-8
Name=Web Browsing Only
Exec=firefox
Type=ApplicationIt will be great if a window manager were to accompany the Firefox window(s) in the session.

Thanks in advance for any help.