Emacs tip: If your instance hangs and won't respond to C-g, you can use `pkill -SIGUSR2 emacs` to force emacs to stop whatever it's doing.
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I don't preserve browser tabs between sessions. It's a surprisingly helpful way of staying on whatever side project you planned to play with.
Emacs lisp isn't really a lisp-2. It's more of a lisp-3: the variable namespace, the function namespace, and whatever has been dumped in the symbol plist.
This is also useful if something is making Emacs slow. SIGUSR2 gives you a traceback, whereas C-g just stops whatever it is. https://twitter.com/_wilfredh/status/659499112677642242