I successfully loaded the new useragent (Firefox on Windows, listed among "acceptable" combinations), but it didn't fool the web site. I deleted cookies and tried again - still no joy. That's a smart web site - with a dumb policy. Is there anything else I can try?
Make sure useragent is turned on, it should be blue in color.
PopularPages A very handy Documentation Search Tool used by many.
Smile today, cry tomorrow!
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Yes it's "turned on," and passes the test offered at the add-on's web site. It just doesn't fool that particular web site I guess.
That would be nice if the school allowed it. But I'll mark it SOLVED, since the browser, on a third attempt, apparently fooled the site using the standard "Firefox on Windows" useragent string. Success! It looks like I'll at least make it through this semester without having to switch OSes!
Thanks to everyone who responded.