Please keep in mind that it is not advisable to use older versions of Firefox, as they do have known security flaws.

That being said, Firefox 9.0.1 is at ftp://ftp.mozilla.org/pub/firefox/releases/9.0.1/win32/en-US/.

Now, is this an extension, or something else that isn't working. You may want to try upgrading to Firefox 11 to see if the software works with it.

Hi, Thank you for the information. We have software vendors that just cannot keep up with the newest versions and so must go with the versions that they are compatible with.

You can install multiple Firefox versions via a custom install in different installation folders and only use the Firefox 9.0.1 version when you really need it.

Do a custom install and install each version in its own program folder to use multiple Firefox versions.

• https://support.mozilla.com/kb/Custom+installation+of+Firefox+on+Windows

Create a new profile exclusively for each Firefox version. 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/Testing_pre-release_versions
• http://kb.mozillazine.org/Profile_Manager#Creating_a_new_profile

• http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
• http://kb.mozillazine.org/Shortcut_to_a_specific_profile