Roboform 7 does support Firefox 4, but Roboform will make you pay for the upgrade from Roboform 6.

There has been no Firefox version 3.9.92 or 6.9.92. Do you want the latest version of Firefox 3.6?

To downgrade to Firefox 3.6 first uninstall Firefox 4, but do not select the option to "Remove my Firefox personal data". If you select that option it will delete your bookmarks, passwords and other user data.

You can then install the latest version of Firefox 3.6 available from http://www.mozilla.com/en-US/firefox/all-older.html - it will automatically use your current bookmarks, passwords etc.

To avoid possible problems with downgrading, I recommend going to your profile folder and deleting the following files if they exist - extensions.cache, extensions.rdf, extensions.ini, extensions.sqlite and localstore.rdf. Deleting these files will force Firefox to rebuild the list of installed extensions, checking their compatibility, and reset toolbar customizations.

For details of how to find your profile folder see https://support.mozilla.com/kb/Profiles

Apparently my reply did not post so I will again thank you for your detailed solution. Considering that it was RoboForm that said that Firefox 6.9.92 supported it, I question if the previous Firefox version would be correct. After so many years of having RoboForm updates for free, I might as well pay the fee to get their Version 7 and be done with it.

Thank you so much for your assistance. Hopefully others will benefit from it too.