As I’ve been reading various discussion groups, it occurs to me that when a user reads that Firefox 1.5.0.1 is out, he/she rushes to the Mozilla website to download it. Sorta puts all that hard work on the update system to waste 
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Yes, I know the majority of Firefox users probably don’t hang out in technical discussion groups; but still, wherever you see an announcement, let them know that 1.5 users can use Help -> Check for Updates.