Rated 4 out of 5 stars

The idea is excellent & the addon is very useful. But having used it for quite some time, I have observed that this addon freezes Firefox while auto-switching to IE, for a few seconds. I am not sure if this is happening only for me, but I tried with & without the addon, but this problem is reproducible. Deserves a five star except for this problem.
@Developer: Any explanation or a fix? Plz help.
And a feature request: Is it possible to use the same switching rule top open specific sites in Chrome? While IE loads within FF, it is nice if chrome automatically opens for those defined sites.

This review is for a previous version of the add-on (0.3.7.1-signed). 

This is a known issue with IE11. I suspect that the latest version of IE has some bugs in handling hosted WebBrowser controls. With IE8 it doesn't cause any freezes after long periods of use.

About the feature request: we don't have the plan, and will possibly never consider anything related to Google Chrome, because it's totally unrelated to the goal of this add-on. But if you wish to, you can write (or have someone write) a user chrome script or another add-on to do the job. Fire IE has the Public API that chrome code can use to obtain switch rules.