Rated 5 out of 5 stars

However, size of data folder (\fireie) becomes considerably large.
I hope for the addition of the function to clear cache.

This review is for a previous version of the add-on (0.2.5.1-signed). 

You can let firefox clear fireie history when shutdown. The setting entry is located at Firefox Options->Privacy->Use custom settings for history->Clear history when Firefox closes->Settings.

Rated 4 out of 5 stars

Excellent!
but..
Font setting of IE is changed forcibly.
It becomes the same as font setting of Firefox.

This review is for a previous version of the add-on (0.2.4.1-signed).