>>> My Info: Win7_64, Nightly 50, 32bit, ID 20160726080520 (2016-07-26) STR_1: 0. Make sure DPI is set to 1.0 1. Restart Firefox with add-ons Disabled 1. Open attached "testcase 1" 2. Scroll the page so that iframe "widget_community.htm" is fully visible 3. Move mouse to the center of that iframe, rotate mouse wheel down, then scroll the page down by one page, then up by one page (via mouse wheel) AR: A dark-blue line appears at the right side of scrollbar ER: No extra blue lines Notes: 1) If you can't reproduce, I recommend to test this on "Jeff' machine" mentioned in bug 1287066 2) Apparently the root case is bug 1147673, so everything done in bug 1289829 may be useless This is regression from bug 1147673. Regression range: > https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=2ec54b38a33da939a8255612999d9e867eb11664&tochange=bb5becd378f40a9be14e4e635d7034f2835fc7b5
From comment 0, the regression is from bug 1147673.
Priority: -- → P3
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