MM3 2011 version Rated 4 out of 5 stars

Nice tools. Has some quirks, but generally nice.
Version 2011 cannot load config file. Go to author site an use version 2011.100 to solve this problem. (http://www.proxy-offline-browser.com/ProxySwitch/)

This review is for a previous version of the add-on (2011). 

Many thanks for your bug report

The bug occurred only into combination with SeaMonkey.
The required correction is available on Mozilla now.