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Firefox changes from 64bit to 32bit when I close Firefox. why?

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I downloaded Firefox 54 64bit. But, when I close Firefox it jumps to 32bit. How can I keep Firefox 54 64bit permanently?

I downloaded Firefox 54 64bit. But, when I close Firefox it jumps to 32bit. How can I keep Firefox 54 64bit permanently?

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Hi,

Would you please take a look at the article :
How to switch from 32-bit to 64-bit Firefox  
just to make sure that you haven't overlooked anything.

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Make sure that you do not have both 32 bit and 64 bit Firefox versions installed.

  • (64 bit Firefox) "C:\Program Files\Mozilla Firefox\"
  • (32 bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"