Earlier quoted context omitted.
I'm running version: 2011031901 This link: http://piro.sakura.ne.jp/xul/xpi/confirm.cgi?treestyletab.xp... gives me: Forbidden Installation You don't have a permission to install XPI package directly from other websites. You have to access this extension from the home page of itself. Am I doing something wrong?
What you have appears to be the latest version (similar to what I have). Weird that I didn’t see that warning though. Which OS are you on? (I am on a mac)
I imagine it will get worked out, but its not until something fails that you realize your dependence.