Rated 4 out of 5 stars

Nice app !!
Would it be possible to open "Chrome" in a FireFox tab ? In the same way that "IE Tab" works with Internet explorer in a Firefox Tab, it should be very very nice, thx !!! : )

This review is for a previous version of the add-on (1.3.5). 

Unfortunately not. Chrome isn't embaddable like IE :(
That's why you haven't seen any addons trying to do that.