Tip: Run Multiple Firefox Profiles/Versions Simultaneously

Posted: Monday, March 23, 2009 by El Guru in Blogs, CyberNet, Firefox, Fx 1.5, Fx 2.0, Fx 3.0, Fx 3.5, Tips & Tweaks

Ever tried to start Firefox while is it is running? Doesn’t work, you will get an error saying Firefox is already running. I have seen a trick over at CyberNet involving installing a portable version of Firefox, but that seems to be a lot of work. Plus, I already have several versions of Firefox installed. So I did a little more search and came across the mozillaZine KB article: Command line arguments

The easiest way to take advantage of this is to modify your short-cuts. The short cut should be formatted as such: “Firefox.exe” -p “{PROFILE}” -no-remote (note: substitute the name of your profile for {PROFILE} or omit to launch the profile manger instead). I have setup and can now run/test Firefox, Firefox 3.0.7 and Firefox 3.5beta4pre at the same time running on their own profiles.

Notes: this tweak does not apply to does not apply to Mozilla Suite/SeaMonkey 1.x. You can also run multiple profiles of the same version of Firefox as well. This can be helpful when you want to see how something behaves with a clean (no add-ons) profile (or to see how quickly a Firefox with a clean profile restarts).

  1. Chris says:

    Awesome. Thank-you for the tip! I should have been doing this ages ago… :)

  2. […] into the Troubleshootize section of FeedBurner. After running a feed validatior I discovered the Tip: Run Multiple Firefox Profiles/Versions Simultaneously was post causing FeedBurner (as well as Firefox Live Bookmark system) to choke. Had something to do […]

  3. Firefox Blog says:

    Utilizzare più profili di Firefox allo stesso tempo…

    Sapevi che è possibile eseguire più di un profilo di Firefox in una sola volta? Questo può essere estremamente utile se si vogliono testare le estensioni più facilmente, creare un profilo di sviluppo web, eseguire un profilo snellito solo per Gmail……

  4. Cheese pizza says:

    When I open firefox browser, I get multiple tabs opening all at once-several… This happened to me – it’s because when you set your home page, you have other tabs open at the same time.

  5. […] a little profile trickery, yes it can be done. If you want to run, 3.5.8 and 3.6 all at the same time, it’s very do-able. I […]

  6. Algen says:


    Where should I put this code?

    ““Firefox.exe” -p “{PROFILE}” -no-remote”


  7. Algen says:


    Now I figure it out, put the code on the Target of you desktop Shortcut

    “C:\Program Files (x86)\Old Mozilla Firefox\firefox.exe” -P Profile -no-remote


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