Rated 4 out of 5 stars

Fantastic job until version 3.45.5.
Now we see backfront windows because of transparency, through title bars (Windows 7 pro here).
So we cannot see icons and text correctly.

This review is for a previous version of the add-on (3.45.5). 

It is already fixed. New version stuck on Mozilla revision queue. You can download it from here:
https://addons.mozilla.org/firefox/downloads/file/431559/ms_office_2003_jb_edition-3.45.6-tb.xpi?src=version-history