What version of Flash is used for Kindle Fire?

The latest Kindle Fire HD is not officially supported by Flash  Player.  Please see this page for a list of all certified devices:

• Flash Player Certified Devices

That said, some users have been able to get Flash Player working on the Kindle Fire by using Dolphin, a third party browser.

• How to install Adobe Flash on your Kindle Fire HD   
• Get Flash on Kindle Fire HD (video)