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I'm not sure if you're part of the Firefox team, but either way sorry I don't remember exactly the circumstances. But it was on Firefox 27 - Mac OSX 10.8 - any page.

Any page that had the dev tools open froze for about 1 to 2 seconds when switching back to it.

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Want to try on the latest release? I can't reproduce with Release (29) or Nightly (32) on 10.9. If you can give some solid STR and a test case we can investigate further, but as it is now, this isn't very actionable from our end :-/

Just tried and there is -ZERO- lag. I'm tremendously happy and the dev tools are white now!

20 tabs, each with it's dev tools open. Zero lags! I'm in love.

:D

We have a light and dark theme; you can toggle back and forth via the options panel (the little cog sprocket thing top left)

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