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Firebug takes over f12 from Devtools.

Ed: you should try ( and provide feedback to ) Firebug 3, they're dong exactly what you described - implementing Firebug UX on top of Firefox Devtools:

https://github.com/firebug/firebug.next

I tried it early on, but it was unusable. I should really give it another go, yeah.

I really dislike how laptops (MB[P] or other) override the function keys with the laptop controls. I know you can usually set it to be Fn+F<key> to do things like volume, brightness but I think the function keys should keep their original uses first.

Yep, function keys were sacrificed so that manufacturers could drop dedicated keys for functions like volume and brightness. I personally think it was a good move, but as a consequence I rarely use the Fn+F* key combos in applications and my apps don't bind to Function keys.

command+opt+i opens tools on OSX