Firefox: Copying profiles

[marc <gmane@auxbuss.com>]

Hi,

I have a Firefox profile that I'd like to make available to another 
user, but I'm struggling to complete this basic requirement 
successfully.

The way I've gone about this is to start by creating a new profile via:
# firefox -profilemanager

Next, I move the newly created ~/.mozilla/firefox/xxxxxx.newprofile out 
of the way and copy the required source xxxxxx.existingprofile to 
~/.mozilla/firefox/, then rename the newly copied folder to 
xxxxxx.newprofile. Finally, I chown -R owner:group *

When I use
# firefox -profilemanager
to use the new profile, Firefox loads, but the display is corrupt. The 
console displays twenty or so error messages similar to:
*** Failed to load overlay chrome://

Any ideas? If there's a better/easier way, please let me know. I looked 
for an extension to do this, but couldn't find one; although there is an 
Windows-only utility available.

-- 
Best,
Marc