Ferrite, the author of the online (as opposed to the desktop) tool that makes Firefox extensions work with Flock, has written a search plugin that makes the process even smoother. Once you’ve installed the search plugin, you select it and then just drag an extension link (ie, a .xpi file) into the search box. Flock’d converts the extension on the fly and provides a link for you to download the converted extension from. So if there’s an extension you’ve been wanting that no one else has ported and you just haven’t felt comfortable porting it yourself, this takes most of the pain out of it without requiring that you install another desktop application to do it. Very cool stuff.