02.10.09
Firefox 3.0.6 plugin disappear on update
The latest Firefox auto update knocked out my installed extensions, leaving the add-on window blank.
It seems that this problem occurs from time to time. The following instructions fixed it by rescanning my plugins:
http://forums.mozillazine.org/viewtopic.php?f=9&t=643885&start=0&st=0&sk=t&sd=a
Note: I believe this only affects a smalll percentage of users.