hey, you can go through the link https://support.mozilla.org/en-US/kb/make-firefox-default-browser-android this simple two step guide will show you how to set firefox android as your default browser.

I tried everything how do you find out what is your current default browser im so confused

Hey, you can also clear defaults by: Settings>Applications>Manage Applications>All>Current Default Browser> Clear Defaults. The next time you open a link from outside a browser, you'll be given the option to set the default browser. Else you can also take help from advanced search questions through https://support.mozilla.org/en-US/search/advanced Please report whether it was helpful. Thankyou.