Content doesn't care if its NPAPI or PPAPI. They are both the same from contents perspective. Also, Chrome does not give you the choice. Its PPAPI or nothing, just like Opera. Opera and Chrome share a renderer of course. Last I heard Firefox was going even further and was simply disabling Flash entirely because of its numerous unfixed security issues.
you are incorrect. farmville 2 runs on the npapi flash. it does run on ppapi but at a snails pace. there are some games designed to play on the npapi flash. yes you can add the npapi flash back into chrome and firefox. i do have npapi in chrome. opera does not give the choice. i would like it added opera to because its faster than google chrome. i have never had a security issue with flash. i dont know what all the hubbub is about over it.
how to firefox:
https://support.zynga.com/article/farmville-2/How-to-unblock-Flash-Player-on-Mozilla-Firefox-en_US-1436884611204
how to chrome:
https://support.zynga.com/article/all/Are-you-getting-the-FarmVille-is-on-3D-now-message-when-loading-your-game-en_US-1429147893189