No, you cannot use the full version of Firefox on a Galaxy A9; you must use Firefox for Android.

Or at least I believe you cannot, maybe wait for another answer if you doubt this answer.

hi, can I use the full version of Firefox on a galaxy A9 or do I HAVE to use Firefox for android? I'd like to have my tool bars that I used on Firefox on a Joytab

Not sure what you mean by full version.

The Galaxy A9 uses Android so you need the Android version of Firefox. https://support.mozilla.org/en-US/kb/install-firefox-android-device-using-google-play

The desktop Firefox from Mozilla is only for Windows, macOS, Linux.