"You're holding it wrong."
Decisions like these make software that's unusable for some people. It's the Apple Syndrome: You either obey the One Steve Jobs Way or you go elsewhere. Let's leave the Apple Syndrome to Apple, and make software everyone can use.
Halfway joking here but I think perfectly ordinary people who just use a few tabs at a time tends to just use whatever thay get their hands on, -IE on Windows or Safari on Mac.
This means there is already a bias here: Those who use FF use it anyway because there is no alternative that has Scrapbook extension (offline browsing w/searchability), tree tabs (for automatic mind mapping) that also handles 100-200 tabs in a good way. (Read up on David Allen on using your memory for real work not to remember addresses and tasks for why some people find this useful.)