Portable FF3: How do I remove "new homepages" from add-ons/extensions?

Lovin' FF3 but hatin' the fact that so many add-ons/extensions create new home pages that launch when I start FF3. I don't see these additional URLs in my tools/homepage list (/en-US.start2.mozilla.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official). What gives? Any idea how to keep these from launching without removing the add-ons?

Add-ons that are creating home pages:
Download Helper
FlashGot
FireShot Pro (though it may just be complaining because I like the free version)
Yapta
FireFox Companion for Ebay