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McGyver wrote:
 Will having both installed on my computer cause a tear in the fabric of space/time leading to the destruction of the entire universe?  | 
As far as I know you can have both...I use FF1,2 and 3 on one computer without any issues....This will not cause a tear in time itself but it will however cause one to time travel...You may start using it at lets say 6am then before you know it 4 hours have passed when it only seems like 1 hour... 
  
Stupid things happen to computers for stupid reasons at stupid times!