You are only passing TCP packets, but not UDP, which are needed by say DNS or DHCP. So when you try to resolve IP address of google.com your pf is blocking those packets from exiting your box. Try with IP address in browser, or put a log word in the block rule, reload config and start tcpdump on pflog to see the blocked packets.
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The best way to learn UNIX is to play with it, and the harder you play, the more you learn.
If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD
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