link from firefox.com/m won't open app and G Tablet has no permission in Android Market

Trying to install Firefox Mobile on a Viewsonic G Tablet, the down load link Firefox.com/M tries to open site market://details?id=org.mozilla.firefox from which I get an error message site is down or moved. If I register with google and try to download from android market I get the "NO android device associated with this account" error message. Would dearly like to use Firefox mobile as I desperately need to be able to scroll within frames on our web pages. Any guidance appreciated. PS I am extremely new to android.