STR: 1. Navigate to a page long enough to scroll vertically and hide the dynamic toolbar. 2. Scroll down to hide the toolbar 3. Scroll up enough to show a little over half of the toolbar Expected: Toolbar animates into position Actual: Toolbar animates into position, but page flashes briefly with the wrong scroll position. I've observed this on a 10.1" Samsung Galaxy Tab 3 and a Tesco Hudl 2 tablet. These are both Intel-chip tablets (though different generations). The Samsung tablet is running Android Kitkat with lots of awful Samsung customisations and the Hudl2 is running a mostly-stock Android Lollipop.

kats, is there an ETA on this bug? The proper fix for bug 1245493 depends on it.

At the moment there is no ETA. The plan here is to converge with other browser vendors on a standard behaviour [1] for the browser when the toolbar is shown/hidden. Right now we fire resize events to content and change the scroll position and such; if we can avoid doing some of that work this bug will probably go away or be easier to fix. [1] WIP at https://github.com/bokand/URLBarSizing/

Re-triaging per https://bugzilla.mozilla.org/show_bug.cgi?id=1473195 Needinfo :susheel if you think this bug should be re-triaged.

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