If you have indeed deleted the "Extensions" folder, you have deleted all of
your addons that were inside it! If so, you'll need to re-install each
addon! If your operating system is Windows XP, here is the usual location of
the "extensions.rdf" file and the "Extensions" folder that you appear to
ha
I wanted to add to this discussion that I encountered this error as well
with Firefox 2.0.0.3 (latest to date) in Mac OS X 10.4.9.
I discovered that, when I get the error, if I restart Firefox and re-try
to install an extension that I have success. But, upon trying to install
another extension, I
