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I conveniently have 39 bookmarks on my bookmarks toolbar (with Smart Bookmarks Bar) + 3 uncategorized, so 42 for me. I hardly use bookmarks anyway since the awesomebar has so much less clutter. Sucks when I'm trying to find something I vaguely remember though. :V
47. It's good to use roughly 500kb as the maximum threshold for what would be acceptable for filesize. Any more than that, it's at risk for being disabled.