How can I have 2 different versions of firefox exist and not interfere with one another?

The two version I want are:

  • Latest, for normal use (sync with mobile, etc)
  • v19, for compatibility with older software (doesn't work on newer versions, due to old ssl protocol errors) and will not be syncing or updating ever.

How can I have these coexist without much hassle?


Simple, just make one or both of them a portable installation.

  • Where can I find portable versions for Mac? Somewhere between v15-v19. All I can find are for windows. – cclloyd Jan 27 '19 at 23:35
  • Well, when I Google for portable firefox mac, the first search result is Version 4.0.1r4.1, so I am not sure about version numbers. I guess that you just have to search – Mawg says reinstate Monica Jan 28 '19 at 7:23

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