How to use two different versions of Firefox at the same time on Snow Leopard?

I recently upgraded to Firefox 4.0 on my 27" iMac running Snow Leopard 10.6.7.
Previously, I was using Google's "Page Speed" along with Firebug in Firefox 3.6.15 to optimize images in my web pages, and to find other areas to optimize.
Page Speed is not yet compatible with Firefox 4.0. I wrote to Google about this some time ago -- no answer yet.
If I run Firefox 3.6.15 in order to use Page Speed, I run into a few problems afterward when I start using Firefox 4.0 again, since they both use the same "Firefox" folder in my "Application Support" folder.
How can I set it up so that I can have two separate "Firefox" folders in my "Application Support" folder?
Or is there an easier way to use two different versions of Firefox simultaneously, even if one has extensions and/or plug-ins installed which are not compatible with the other version?
Thanks for a great browser!

Please disregard my question. I just conducted more web search and learned how to use Firefox's profile manager in order to make a separate profile for Firefox 3.6.15.
You can find instructions on this page:
http://support.mozilla.com/en-US/kb/Managing%20profiles#os=mac&browser=fx35
'''A small tip:'''
If your Firefox app is named anything other than "Firefox" -- say for example "Firefox 3.6.15" -- when you follow the instructions at the above link, make sure you escape the blank space that is before the version number by adding a backward slash before it, when you type the command string in the Terminal. In other words, in that string, you should use this:
Firefox\ 3.6.15
I hope that helps someone.
WW

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    I currently have FiOS with Verizon, they ran a coax cable to the Verizon router. I didn't ask them to switch to CAT6 cable since I have an airport extreme base station and an airport express base station (both are the newest generation). I ran a CAT6 cable from the Verizon FiOS router to my AEBS (extreme) to make it the default wireless router. The Verizon router and extreme are in one room. Now, the Airport express is in my living. I'd like to extend the wireless network from the extreme. However, I can't seem to find a way to use both wired and wireless from the airport express at the same time. It's now either via wired, or wiresless. So is there a way to get both work?

    Can you tell us if you used Apple's instructions for a "roaming" network?
    http://support.apple.com/kb/HT4260
    Although the instructions picture a 2nd AirPort Extreme in the illustrations, the setup instructions would be exactly the same for an AirPort Express.

  • I have to use two different versions of Firefox for two different employers - How to install new version without losing old one?

    One employer requires that I use Firefox 3. Another requires that I use the newest version. How do I install a new version Firefox to a different path without over-writing the old version?

    The easiest way it to have one version be a Firefox Portable installation. The Portable installation is self-contained and won't affect your "regular" Firefox installation.<br />
    http://portableapps.com/apps/internet/firefox_portable
    Otherwise you need to set up a Profile specifically for the 2nd version and make sure the correct Profile is launched with each version. <br />
    [http://support.mozilla.com/en-US/kb/Managing+Profiles] <br />
    http://kb.mozillazine.org/Shortcut_to_a_specific_profile
    Overall you are probably better off replacing your current Firefox 3.6.25 version with the Portable Apps version - http://portableapps.com/apps/internet/firefox_portable/localization#legacy36 - and install Firefox 9.0.1 as your "regular" installation.

  • How to use two different versions of the same jar within one project

    Hi everybody!
    I have a big problem while integrating different web service clients within one bigger java project. Both implemetations need some jar files to work but demand different version. So, i would like to know if there is any way to tell which implementation should use which version! Anyhow i add those jars to the classpath makes working only one or the other webservice working but never both! Any ideas somebody?
    Best regrads,
    Stefan G�tz

    Of course do have the jar files different names but the classes inside of them are the same ... means that the standard system classloader can distinguish them. When you add a jar to a classpath the name actually dosent matter.... any other ideas, please?
    PD.: i tryed to add a manifest file to the one jar which makes use of one of the dublicated jars to specify which jar to take direcly but it makes no difference since once classes loaded they cant be distinguish ....see:
    http://java.sun.com/docs/books/tutorial/ext/basics/load.html

  • I would like to use firefox to access two different yahoo email accounts at the same time. I am using Firefox 4 with Windows 7 Home Premium. Can you help?

    This might be solved using two sessions. How do I do that?

    You should be able to do this by using the Multifox add-on - http://br.mozdev.org/multifox/

  • Using two or more JRE's at the same time?

    Our company uses 1.4.2-b08 as default JRE, but some departments still have 1.3.1 as standard since business applications must use this version. We've tried migrating to 1.4.2 and 1.5.0 but they were not backwards compatible (or simply not JRE compliant programmed).
    What I'd like to do is deploy 1.5.0 as 'default JRE' so that every website or intranetsite through IE6/Firefox is secure, and leave old JRE's on every workstation so that non-browser applications can still run.
    Questions:
    -if some applications run through a browser, is there a possibility through commandlines or startup options in a link or batchfile to use the non-default JRE?
    -using a link that refers to the 1.4.2 or 1.3.1 java.exe (plus the other variables for the application to run of course, instead of simply java.exe without path/directory names), seems to work fine - but does it?
    -with starting an old JRE through this commandline, do the libraries of the same the new/default JRE version get called on? I'm not sure whether Windows or the JRE first look in the environment settings of Windows XP, in the current path of java.exe and higher subdirectories or in the registry?

    Our company uses 1.4.2-b08 as default JRE, but some
    departments still have 1.3.1 as standard since
    business applications must use this version. We've
    tried migrating to 1.4.2 and 1.5.0 but they were not
    backwards compatible (or simply not JRE compliant
    programmed).
    What I'd like to do is deploy 1.5.0 as 'default JRE'
    so that every website or intranetsite through
    IE6/Firefox is secure, and leave old JRE's on every
    workstation so that non-browser applications can
    still run.
    Questions:
    -if some applications run through a browser, is there
    a possibility through commandlines or startup options
    in a link or batchfile to use the non-default JRE?If you're using applets, or Java Web Start to start applications, yes. Applets use html, WS uses jnlp files. Other than these, not that I'm aware of.
    -using a link that refers to the 1.4.2 or 1.3.1
    java.exe (plus the other variables for the
    application to run of course, instead of simply
    java.exe without path/directory names), seems to work
    fine - but does it?If you're running java applications from the commandline (ie, executing java.exe) then yes, if your machine is correctly configured.
    -with starting an old JRE through this commandline,
    do the libraries of the same the new/default JRE
    version get called on? Yes - see prior reply.
    I'm not sure whether Windows
    or the JRE first look in the environment settings of
    Windows XP, in the current path of java.exe and
    higher subdirectories or in the registry?If you supply a full path to an executable that is the executable that will run. If you machine is mis-configured, other problems can subsequently occur.

  • How to install two different versions of firefox in same OS ?

    please help as i need both of them
    some plugins not working in the new one !!

    Do a custom install and install each version in its own program folder to use multiple Firefox versions.
    * [[Custom installation of Firefox on Windows]]
    Create a new profile exclusively for each Firefox version and create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.
    See these mozillaZine KB articles for information:
    * http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
    * http://kb.mozillazine.org/Shortcut_to_a_specific_profile
    * http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

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