Randomly stumbled across Firebug on an old Stack Overflow thread and thought it's cool.

https://stackoverflow.com/a/2535851/5404958

Canonical post:

https://news.ycombinator.com/item?id=15542263

Some other "recent" mentions:

https://news.ycombinator.com/item?id=41679528

https://news.ycombinator.com/item?id=41749203

https://news.ycombinator.com/item?id=32395518

https://news.ycombinator.com/item?id=24459539

https://news.ycombinator.com/item?id=13219980

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