Richard Newman [:rnewman] Reporter
	Description • 10 years ago

See screenshot.

	Chris Peterson [:cpeterson]
	Comment 2 • 10 years ago

Richard: are you using the Tree Style Tabs or Vertical Tabs addon? Do these graphic artifacts go away if you refresh the tab?

	Richard Newman [:rnewman] Reporter
	Comment 3 • 10 years ago

I'm using Darrin's Vertical Tabs, yes.

The page responds to mouse events (e.g., mouseover of a link) by redrawing regions. IIRC, it also redraws with refreshes and significant window events (switching tab?).

	Mike Conley (:mconley) (:⚙️)
	Comment 4 • 10 years ago

I sometimes see this, especially browsing the Facebook feed, in an e10s window.

I thought bug 837489 was a dupe, and while the symptoms are similar, I think the causes are likely slightly different (since in this bug, the chrome isn't affected).

	Mike Conley (:mconley) (:⚙️)
	Comment 5 • 10 years ago

Going to try to get some STR in here.

	Mike Conley (:mconley) (:⚙️)
	Comment 6 • 10 years ago

Couldn't get anything reliable - though I saw it periodically. Usually when the process was under heavy load (loading a large site), and scrolling an iframe or overflowed w scrollbar element.

	Mike Conley (:mconley) (:⚙️)
	Comment 7 • 10 years ago

Still no luck. Sorry. :/

	Mike Conley (:mconley) (:⚙️)
	Comment 8 • 10 years ago

I may have found a way of restoring some of the black box behaviour.

I experience it when visiting this site:

https://www.mozilla.org/en-US/firefox/os/

And then scrolling down. This causes black-boxing, and then not long after, a crash.

	Brad Lassey [:blassey] (use needinfo?)
	Comment 9 • 9 years ago

The people in triage haven't seen this in months, so reopen if you still see it and give STR