Data Bridge includes the following extensions:
--CSS Button Styler
--CSS Form Builder
--DataAssist
--Digital File Pro
--Dynamic Connections
--Dynamic Dropdowns
--Dynamic Web Charts
--Form Toolkit
--HTML Editor
--Image Resizer
--SecurityAssist
--Universal Email
--Validation Tooltips for Spry
--Framework Builder
if you have any of those installed, you should remove them before installing it
for Design Extender, these extensions are included:
-- CSS Sculptor
-- CSS Menu Writer
-- Framework Builder
-- PowerCMS Builder
-- Pro Maps for Google
-- Site Import
-- Site Sculptor
-- Social Media Toolkit
all of those extensions would need to be removed before installing design Extender.