I think the current flexbox panel might provide enough value to internal developers that it might be worth considering enabling in Nightly for their benefits.

What's the difference to bug 1470380? (If there's a difference, it may be documented at https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features#flexbox-inspector.) Sebastian

Hmm, I didn't mean to set the dev-doc-needed keyword yet. Sebastian

This bug refers to milestone 2 of our flexbox inspector (devtools.flexboxinspector.enabled) which adds more information (specifically about sizing) to the sidebar. Milestone 1 was solely for the on-page highlighter (devtools.inspector.flexboxHighlighter.enabled). So, basically the feature consists of two standalone parts that have been shipped separately. With this patch landing, both prefs will default to true in Nightly and the MDN page will be accurate.

Pushed by gabriel.luong@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/20f8b06e1ac6 Enable the flexbox panel in Nightly. r=rcaliman