Use Firefox ? Should i abandon Microsoft's IE 7 ?

hi…lots of ppl are saying Fire fox are a million times better then IE 7…more security…safe and trusted…

but heres a question…IE 7 is from microsoft right ? Microsoft things are always trusted…isnt it ? they release patches every now and then…and some people says IE 7 are not enough security and IE 8 is still in beta so dont use it…

so … if i convert to firefox now … should i use back IE 8 when its not beta anymore…when its officaily open.

and…why is fire fox better then ie7 ? just asking…they are browser too right…and you cant patch it…microsoft have automatic updates and Windows updates… microsoft updates to patch any holes found…

i really want to change to firefox now but i need to know these …

to have safe mind for changing to firefox…=)

cheers

tanmx