Muse, see this link:
http://forums.mozillazine.org/viewto...f=23&t=2280605
To change your update channel:
1. Close Firefox.
2. Go to the Firefox program directory.
3. Enter defaults\pref
4. Edit channel-prefs.js in Notepad.
Change:
pref("app.update.channel", "
release");
to the one you desire. Update channels to choose from:
nightly
aurora
beta
esr
release
Example:
pref("app.update.channel", "
beta");
5. Save and exit.
6. Re-open Firefox.
To check the change, open about
:config and enter:
app.update.channel. The channel should now be the one you chose.