Comment 2 for bug 249028

Dear Wayne,

I think, it isn't a bug, mainly not an ubuntu and/or firefox bug, neither a vmware bug.
There is an install.rdf file in extension-file (jar/xpi), wich is contains the informations about the destination requirements (e.g. minimum/maximum version number of firefox versions).
In the xpi file what is distributed by VMware the limits are 1.0 as minimum, and 3.0 as maximum, so, you need the edit it, before install into your browser.
Find the following file(s) on your vmware host:
/usr/lib/vmware/webAccess/tomcat/apache-tomcat-<VERSION>/webapps/ui/plugin/vmware-vmrc-linux-x86.xpi
or /usr/lib64/... or vmware-vmrc-linux-x64.xpi.
Expand it (them) with unzip into a temporary directory, or open it (them) with midnight commander.
Find the install.rdf file in the root of this directory, and edit it with your favorite editor.
Modify the <em:maxVersion>3.0.0.*</em:maxVersion> line to <em:maxVersion>3.0.5.*</em:maxVersion>.
Save the file, and repack this directory with zip into a new archive with same name and extension (e.g. vmware-vmrc-linux-x64.xpi). (or just close the opened archive by mc)
Replace the original file with the new one (of course you need to back up the original versions).
After this step you can reinstall the extension through vmware UI without any problem.

Cheers, Peter