AnkiDroid on Kindle Fire (Addons)? How can I add addons to my Kindle Fire 7 HD version of AnkiDroid downloaded from GoogleCode (featured)?
AnkiDroid developer here.

Google Code is not used anymore, it only contains very old versions that are not compatible with anything anymore.

The newest versions can be found here:

https://github.com/ankidroid/Anki-Android/releases

That being said, Addons are not available yet for AnkiDroid.
We have started developing an Addon system but it won't be ready before next year, thanks for your comprehension!