For those interested in peeking under the hood, here are the 100+ patches that landed this week:https://github.com/mozilla/gecko-dev/commits?author=bhackett1024 …
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OMG! @FirefoxNightly just got time travel debugging. Best birthday present ever! 
Here are all the deets. Can't wait to hear what you think!
https://gist.github.com/jasonLaster/1e220992c294a571dd9b59abd084ccf2 …pic.twitter.com/C91O5PxJZL
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Tried it, but getting an "HandleDirtyMemoryFault failed 0x0 MOZ_RELEASE_ASSERT(Thread::CurrentIsMainThread())" alert in the tab being recorded.
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That's definitely a fail state. What Mac os do you have? What page are you debugging? Also do you have other tabs?
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Mac OS 10.13.something (can't check atm). I was debugging http://bitbucket.org . Yeah I had heaps of other tabs open :).
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haha nope it definitely crashes! Nice find :) I'll share it and report back the fix
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For real ?!
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fo realz
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One like is not enough to to express how I feel
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Reminds me of one of my favorite lines, "I don't like it. I LOVE IT!"
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Looks great. Question though, would it be possible to implement a 'go back one step' in live debugging (without record / play)? I've always wondered why debug tools don't come with such a feature
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Hmm. The easiest thing would be to leave and re-enter a function. Everything else has so many edgecases
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Maybe in future, runtime engines would maintain a kind of version control internally for variables that can revert back changed values in such scenarios.
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Kinda like immutable state perhaps. With a recording it's possible to post process and do all kinds of cool queries.
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What theme is that?
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but the built in light theme is white, also in nightly...
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Sorry thought you meant devtools theme. It's quantum lights!
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howto use it? is it available in nightly or do I need to set a pref?
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the pref mentioned in https://gist.github.com/jasonLaster/1e220992c294a571dd9b59abd084ccf2 … is not available in my ff nightly 63.0a1 (2018-07-26)
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It should be there if you are you on a mac? https://searchfox.org/mozilla-central/source/modules/libpref/init/all.js#1056 … -- devtools.recordreplay.enabled
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ohh I didn't realize its mac os only... the disclaimer is at the very end of the gist.
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Yeah. I'll fix...
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