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When I start Firefox it opens two instances at once

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v7.0.1, running under Windows XP: I thought the Tabbed Browsing feature looked really useful and spent an hour or so created a number of Tab Groups from my bookmarks. However, now when I start Firefox it opens two instances immediately, one correctly with my Tab Groups available but also another with just the home page. Apart from not wanting the second instance, there's now the risk that if I close the wrong one first, all of my carefully set up groups will disappear. Something has gone wrong - how to correct it?