Firefox extension problem

[Dave Close]

I'm try to follow the instructions provided by Don Marti at
<https://blog.zgp.org/scale-20>;. This involves adding an extension
to Firefox but it doesn't work for me. Evidently it does work for
Don on some other version of Linux.

I'm running Firefox 110 on Fedora 37 with KDE. I have successfully
installed the desired extension, "Multi-Account Containers", but do
not see the container icon. I can reach the container management page
via the Addons link and have added a YouTube container. And the addon
is enabled. But I can't find any way to say, ���������always open this site
in container���������.

In case it matters, I see that FF's addon page reports that this addon
requires container tabs and marks the addon as disabled. If I enable
them and then enable the addon, when I return to the addon page, it
shows the container tabs option checked but dimmed, the only option
for the addon itself is "Disable Extension".

I have also reported this to Mozilla
(<https://bugzilla.mozilla.org/show_bug.cgi?id=1823561>) but, since
this behavior seems to be unique to my situation, I'm also reporting
it here.
-- 
         Dave Close, Compata, Irvine CA       [phone]
       dave(a)compata.com              dhclose(a)alumni.caltech.edu
   "Some ideas are so stupid that only intellectuals believe them."
                                     -- George Orwell