Re: Tabbing through form fields in app doesn't work in Firefox.
Are you really still running Firefox 3.6? Since it hasn't received any security updates for nine months, you may be putting yourself at risk.
In my experience, tabbing through forms works just fine. Have you tested in Firefox's Safe Mode to see whether the problem is caused by a custom setting or add-on.
First, I recommend backing up your Firefox settings in case something goes wrong. See Backing up your information. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
Next, restart Firefox in Safe Mode by holding the Shift key when you double-click the program icon.
In the Safe Mode dialog, do not check any boxes, just click "Continue in Safe Mode."
If tabbing works correctly, this points to an add-on or custom setting as the most likely cause of the problem.