My only reason for avoiding FF 5... Rated 5 out of 5 stars

Gosh, I can't do without MeasureIt. It's just vital... How else can you see how wide to make DIVs in webpages, etc.? So I'll have to postpone upgrading to FF 5 until you update it, Kevin... I imagine a lot of your other Web-developer users are doing this too. Hope you'll have time to do this soon! Thanks!

This review is for a previous version of the add-on (0.4.8).  This user has other reviews of this add-on.