What is the best way to profile javascript execution?

Firebug

Firebug provides a highly detailed profiling report. It will tell you how long each method invocation takes in a giant (detailed) table.

console.profile([title])
//also see
console.trace()

You need to call console.profileEnd () to end your profile block. See the console API here: http://getfirebug.com/wiki/index.php/Console_API

Blackbird

Blackbird (official site) also has a simpler profiler (can be downloaded from here)

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