Question re User Agent Switcher - SSL aware browser

[satimis]

Hi all folks,

Debian (testing/unstable)
Mozilla 1.0.
=========

I have "User Agent Switcher" of

http://chrispederick.myacen.com/wor...ragentswitcher/

installed but could not find it from
Tool -> User Agent Switcher???

I tried to install 'User Agent Switcher" again but was not allowed with following warning popup;
Alter
The installation of the extension failed.
-215

I tried to contact the developer according to his email address on "User Agent Switcher FAQ" without reply.

Kindly advise where can I post for assistance.

TIA

B.R.
satimis