I want to extensions to my Sketchup GO.Is it possible, if not why.
No. Because there’s no implementation of Ruby for internet browsers.
What extensions are you wanting to use?
How about Sketchup Shop which I bought the license.
Sketchup shop is now sketchup go, and based online in the same interface as sketchup web (the free version)
Exstensions are only available in sketchup pro, the desktop version.