howto install FF 4.0 and 3.6 together
4.0 is B, not fully supp by add-ons, but wanting to give it try NOW /incl. jetpack SDK's/ 3.6 is OK, cool&proven
New v. rewrites older one,..so..???
I may try some VM install, but...
Chosen solution
When you install Firefox 4 choose the custom install option and specify a different location to install it.
You then need to create a profile to use with Firefox 4 (user data such as bookmarks is stored in the profile), for details on how to create a profile see http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
Next you need to set shortcuts for each version so that they open the correct profile, details of how to do that is shown here - http://kb.mozillazine.org/Shortcut_to_a_specific_profile
You will not be able to run the 2 versions at the same time. If you want to do that, you nee to use the -no-remote command line argument as shown here - http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile
An alternative approach is to install the Firefox portable edition, this will use its own profile folder and not interfere with the Firefox 3.6.* profile. You can get it from http://portableapps.com/apps/internet/firefox_portable/test
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Chosen Solution
When you install Firefox 4 choose the custom install option and specify a different location to install it.
You then need to create a profile to use with Firefox 4 (user data such as bookmarks is stored in the profile), for details on how to create a profile see http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
Next you need to set shortcuts for each version so that they open the correct profile, details of how to do that is shown here - http://kb.mozillazine.org/Shortcut_to_a_specific_profile
You will not be able to run the 2 versions at the same time. If you want to do that, you nee to use the -no-remote command line argument as shown here - http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile
An alternative approach is to install the Firefox portable edition, this will use its own profile folder and not interfere with the Firefox 3.6.* profile. You can get it from http://portableapps.com/apps/internet/firefox_portable/test
It's the proper /1st para contains sufficient answer/ and really, really comprehensive, all aspects included, reply
Thnx and wishing you a nice day...