Hi danwalsh,
No need to wait for dollar5 as this is a 2min fix, updating the FF plugin to work with v3 is very simple, open the install.rdf within the .xpi package and look for the section below.
Code:
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>1.0</em:minVersion>
<em:maxVersion>3.0.*</em:maxVersion>
</Description>
The important part of the plugin is <em:maxVersion>3.0.*</em:maxVersion> as this tells FF3 the plugin is compatiable. In your plugin it may say 2.0.* or may not be there at all.
Fixed
