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every time I start Firefox, 5 tabs open, even though I have set the home page to one site

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I have used Firefox for a long time, but the new version 4 is problem city! Every time I open it, I get five tabs opening to the updated add-ons. I have tried several times to set my home page without success. Help!

I have used Firefox for a long time, but the new version 4 is problem city! Every time I open it, I get five tabs opening to the updated add-ons. I have tried several times to set my home page without success. Help!

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This can also be a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.

See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.