Firefox 4 requires an update to Roboform 7 and that version needs to be purchased and is no longer free.

• http://www.roboform.com/support/faq/roboform-v7

As an alternative you can look at LastPass.

• LastPass: http://lastpass.com/

See https://support.mozilla.com/en-US/questions/799230

Roboform has two different products, the Full Roboform Toolbar and Roboform Pro.

If you are using the Full RoboForm Toolbar, install the Roboform adapter for Firefox 3.0 - 4 beta X from here:
http://www.roboform.com/firefox.html

Scroll down that page, you want the one shown under:
Additional Full RoboForm Toolbar Information
RoboForm Installer Installs Adapter Automatically into Firefox

Or, you can install it from this link:
http://www.roboform.com/dist/roboform-firefox-3-4-frozen.xpi

i have v6 roboform and i am not upgrading to v7 and non of the above will work how can i go back to version 3.9 firefox because that version worked.

To downgrade to Firefox 3.6 (there was no 3.9) 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

thanks for getting me 3.6 but now my toolbar for roboform does not even show up

i go into veiw/toolbars/ then go to check roboform and nothing happens

How about running BOTH versions of Firefox - (as per Blas answer)

http://answers.yahoo.com/question/index?qid=20110406041627AAi0QX8