I am running GnR 6.0 so I can't help ya there. If you are running FF 3.5.x you have to set the max_version in the RDF file in the XPI to:
3.5.*
You can just uncompress the XPI like a ZIP file then make the edit using a plain text editor like Notepad (Win), TextEdit (Mac) or Kate (GUI, Linux) or pico/nano (CLI, Linux).
Once done then ZIP it and rename the file extension back to ZimbraDnD-v1.1.2.xpi or something like that.
For me it doesn't work b/c 6.0 is still out for development. |