Run Firefox 3 and Firefox 4 at the same time on Mac OS X

by AJ on March 22, 2011

So Firefox 4 just came out and if you are like me, you are already itching to try it out. However, you were probably thinking if you can run the old Firefox 3 and new Firefox 4 at the same time on your Mac OS X. It maybe because you’re not yet ready to ditch Firefox 3 yet or you need it for website testing. Either way, here’s how you run both of them at the same time:

1) Download the new Firefox 4

2) Create a new folder on your desktop. Let’s name it “Firefox 4

3) Double-click the installation file. Usually “Firefox 4.0.dmg“. You will see something like below…

4) Drag the Firefox icon to your newly created folder “Firefox 4“. Not on that Applications folder.

5) Select the Firefox icon, hit “Enter” and let’s rename it to “Firefox 4“. Why? You need to distinguish them quickly when you’re opening them up. Especially if you will use it on your dock together with Firefox 3. See below…

6) Now let’s create a new Profile specifically for Firefox 4. Open your “Apple Terminal” (You can find it in Applications >> Utilities >> Terminal). Upon opening, it should look similar to this…

a) Let’s type in the following below:
cd /Applications/Firefox.app/Contents/MacOS/

b) Hit “Enter”
c) Then type:
./firefox-bin -ProfileManager

d) Hit “Enter” again. Your Firefox Profile Manager should now open and you should see something like below…

e) Let’s create a new profile. Click “Create Profile…” >> “Continue” >> On the “Enter new profile name:” type in “Firefox 4” (I used AJ Firefox 4 just to be consistent with my old one) >> Finally, hit “Done” >> Un-tick/Un-check “Don’t ask at startup

7) Finally, you can open up your new Firefox 4 by selecting your newly created Firefox 4 profile >> “Start Firefox

8) You’re done. Enjoy!

It’s really nice to see them run side-by-side

Hope this tutorial helped.


4 comments

[...] to try out Firefox 4 without uninstalling Firefox 3 from your MAC ? Head straight to this page and read the instructions on how you can run Firefox 3 and Firefox 4 at the same time in MAC [...]

by Ultimate List of Learn About Trick Firefox 4 » genool.ueuo.com - Sit, Relax and Read! on March 30, 2011 at 8:26 AM. Reply #

[...] to try out Firefox 4 without uninstalling Firefox 3 from your MAC ? Head straight to this page and read the instructions on how you can run Firefox 3 and Firefox 4 at the same time in MAC [...]

by Ultimate List Of Firefox 4 Tips; Tricks And Hacks You Should Learn Right Now on March 30, 2011 at 6:34 AM. Reply #

[...] On Mac OSXWant to try out Firefox 4 without uninstalling Firefox 3 from your MAC ? Head straight to this page and read the instructions on how you can run Firefox 3 and Firefox 4 at the same time in MAC [...]

by Best Firefox 4 Tips and Tricks | Firefox 4 Tips | Firefox 4 Tricks | Firefox 4 Hacks on March 30, 2011 at 6:24 AM. Reply #

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