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Run two versions of Firefox on Mac OSX

Mar 23 2011

Yesterday Firefox 4.0 was released and web developers everywhere celebrated a really great browser.  The browser comes packed with a super fast JavaScript engine called JägerMonkey. Now don’t get too excited just yet! We still need to keep that old version of Firefox around for testing; we can’t assume everyone has upgraded to Firefox 4. So, to run both Firefox 3.6 and Firefox 4.0 on the same machine, just follow these simple steps:

  1. Open up your Applications folder and find your old version of Firefox
  2. Right click-> get info.
  3. Rename to “Firefox36.app”
  4. Download Firefox 4.0 and install as normal
  5. Celebrate that you now have 1 more browser to test in!

Really simple! If someone knows how to do this on the Windows and Linux side, I would love to hear how.



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5 Responses to Run two versions of Firefox on Mac OSX

  1. Dylan Valade says:

    Excellent! I did not update to FF4 yet because I was afraid my 3.6 would be lost forever.

  2. Tony says:

    For every FF version known to man…visit: ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/

    Any idea how to run different versions of Chrome?

  3. Michael says:

    A faster way to rename is to open FF in Finder, select the item, press return/enter and change the name.

  4. Pingback: Instalar dos versiones de Firefox a la vez en Mac | Punto Geek

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