Privacy isn't in diametric opposition with advertising, however, as Eich himself said in a subsequent tweet. Clearly explaining why you're being shown ads and what exactly — if anything — is being tracked by those ads is key. Earlier this year, Mozilla announced plans to introduce basic ads to Firefox's New Tab screen for new users that haven't built up a browser history yet, though it plans to move cautiously after a fierce backlash.
One thing is clear: Mozilla needs to dredge up something to differentiate Firefox and lessen its reliance on Google's cash, especially if Firefox's eventual role is indeed to become the anti-Chrome. While Eich's tweets are now the mere musings of a former CEO and far from the official roadmap, he was a Mozilla co-founder and CTO before his brief ascension to the lead role, so the suggestions he's making might already have some traction inside the Mozilla Foundation's walls.
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