TurboTax browser support question - mostly about the browser.

I’m trying to run TurboTax on the latest version of Firefox (I have and have tried other browsers, to no avail), itself running in an up-to-date Ubuntu environment. The support page keeps telling me to enable cookies (which I have), and is generally being unhelpful.

It had been working previously, even with full-strength paranoia settings.

Another computer, this one running Windows, has not had the same problem.