Mozex - External Editor for Blogs/Wiki ect...
By glennf on Aug 21, 2006
On OSX, you have to use the "open" command in-order to run Aqua apps using this plugin. This is configured in the Tools->Extensions->Preferences.
/usr/bin/open /Applications/TextEdit.app %t
Newer versions of Firefox include an inline spell checker. I have tested it on 1.5 on OSX and 2.0beta on Solaris.