Beta version of firefox and jaws 7

Hi all, I have downloaded a beta version of firefox 1.5 to try with jaws. 
Before installing it I have a few questions which I wish to put before you all 
with a hope that I will find answers.
 
Does the beta version of this software instal itself over the already installed 
program, I mean firefox version 1 in My case? is it possible to instal it 
seperatly with out effecting the present version of the software already 
installed on My machine? and finally will jaws provide speach support during 
the instolation of the beta version.
 
Looking forward for your quick response.
 
Thanks and regards,
Fayaz

                
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