> this is money they generally don't have to pay taxes on because of their status as a non-profit.

Minor nit here - they don't have to pay taxes because they don't make a profit, not because of their status. If a for-profit corporation doesn't make profit (and few tech companies do), they won't have to pay income taxes either.

$375k per employee for a pure technology company doesn't seem outrageous? That has to include facilities too.

It's hard not to read into your message the suggestion that you'd like Mozilla to outsource development to lower-wage countries. I really doubt that's going to succeed in a challenging and competitive market like browsers. IMO they'd be better off spending more trying to poach the best brains behind Chrome.