Rated 5 out of 5 stars

Glad to get this working again!!
A couple of points to add re using this with v3.5:
* When editing the install.rdf file make sure you edit the '' value under the '' section, and not the 'Seamonkey' section like I first did...
* The installation xpi file can be downloaded from the developer's site by right clicking the 'Install' button and saving.