Certain site support earlier versions of FireFox 3.6. Is there a compatibility mode within Firefox 7.0

Certain web sites state browser versions for viewing compatibility, and these are older versions of FireFox. The site does state that FF3.5 & 3.6 are supported and I have a VMWare Image with FF3.6 and the pages are displayed correctly.
After installing the latest version, on Linux, I am not able to run the earlier versions. It seems to re-direct to the latest version.
I still have the script that started FF3.6, which looks for the /usr/lib64 directory and it has the directory /usr/lib64/firefox-3.6, yet when I run up the /usr/bin/firefox-old, I get FF7 started ...
I guess this query is two questions:-
1. How to run multiple versions of FF 3.6 & 7 in Linux
2. Certain sites do not support FireFox above 3.6, and is there a 'compatibility mode' to run FF7 as FF3.6 ??
I have opened the page in Firebug, and the body is indeed empty. There are Javascript modules recorded.

Reference site:-
http://odyniec.net/blog/2010/02/running-multiple-versions-of-firefox-in-ubuntu-9-10/
I have modified the original Fedora firefox script from /usr/bin/firefox to be /usr/bin/firefox-old.
Then I modified the script firefox-old to change the LAUNCHER from "/usr/bin/firefox" , which now points to my FF7.0.1 to the $MOZ_PROGRAM which has been setup earlier to the correct binary /usr/lib64/firefox-3.6/firefox<br />
<br />
<pre><nowiki>##
## Set MOZ_APP_LAUNCHER for gnome-session
export MOZ_APP_LAUNCHER="$MOZ_PROGRAM -no-remote -P Firefox-3.6"
</nowiki></pre>

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Certain site support earlier versions of FireFox 3.6. Is there a compatibility mode within Firefox 7.0

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