Here's the stack: onxbldragover@chrome://browser/content/tabbrowser.xml:1391:9
Whiteboard: [ohnoreflow][qf][photon-performance] → [ohnoreflow][fxperf]
Without knowing which exact version of Firefox was used to report the bug, it's difficult to match the line number to a specific line in the code, but the "dragover" handler in tabbrowser.xml has several getBoundingClientRect calls so there are obvious issues... https://searchfox.org/mozilla-central/rev/2466b82b729765fb0a3ab62f812c1a96a7362478/browser/base/content/tabbrowser.xml#1358,1374,1380
Component: Untriaged → Tabbed Browser
Whiteboard: [ohnoreflow][fxperf] → [ohnoreflow][fxperf:p3]
I tagged Trunk under Version when I submitted this, so whatever version of Nightly was available on 12 August 2018. (In reply to Florian Quèze [:florian] (PTO until August 27th) from comment #1) > Without knowing which exact version of Firefox was used to report the bug,
STR: Click and drag a tab from one window, and move it along the tab strip of another window.
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