General, one should always check the URL when "offered" or asked to submit any personal information, at least when it seems unusual. I do.
I even check the URLs each time I enter my bank account online.
EACH time. Just in case a piece of malware should all of a sudden appear somewhere trying to redirect. Thing is, there are cons trying to mask their pages as something else: bad people can replicate the layout and such, but the browser will always show you the URL - heed it.
A little while ago, with my Firefox there was a redirect to a "Mozilla upgrade offer", but the URL was not of Mozilla's. I had trouble to close the page/tab, managed to only do that with my system Task Manager; then I reopened the browser, found that wrong URL in the history, and reported it. You should do the same