Bug 1510360 makes the "dynamic reflow root" optimization produce invalid layout in some edge cases (and that's bad, because this feature isn't supposed to have any detectable effect besides improving performance). I'm hoping to have some time to fix bug 1510360 for this Nightly 67 cycle, but I'm not 100% sure that I'll have a patch ready in time for beta uplift early in the I think we should just pref off dynamic reflow roots on beta/release for the Firefox 66 cycle; they'd probably benefit from a bit more testing, anyway.
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Bug 1510360 makes the "dynamic reflow root" optimization produce invalid layout in some edge cases (and that's bad, because this feature isn't supposed to have any detectable effect besides improving performance). I'm hoping to have some time to fix bug 1510360 for this Nightly 67 cycle, but I'm not 100% sure that I'll have a patch ready in time for "comfortable" beta uplift timing. I think we should just pref off dynamic reflow roots on beta/release for the Firefox 66 cycle; they'd probably benefit from a bit more testing, anyway.