1282654 - Page background drawing image data from other tabs, even across Normal/Private windows

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[Taylor Hunt]

Attachment: You can see bits of my New Tab page here

Steps to reproduce: visit http://www.egidino.com/2010/07/naga-dan-dinosaurus.html

What happened: Image data from other tabs is drawn as the page's background, and blocks of static which I'm assuming are memory that isn't image data

What should have happened: The declaration is -moz-linear-gradient(right top 45deg, #408AD4, #00264C), so I'm assuming that. Removing that style in DevTools makes the page snap back to normal.

Comment 1

[:Gijs (he/him)]

Works for me. Can you provide the contents of "about:support" (Help > Troubleshooting information) and check if this still happens if you use safe mode (Help > restart with add-ons disabled -- also disables graphics hardware acceleration) ?

Comment 2

[Taylor Hunt]

about:support

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}

Comment 3

[Taylor Hunt]

In Safe Mode, I'm not getting the same problem, but now it's a black gradient that changes its size as I scroll down, but doesn't revert when I scroll back up.

If it helps any, I'm also running Firefox in OSX's new pseudo-fullscreen Workspace mode, which has caused a few visual hiccups in the past.

Comment 4

[:Gijs (he/him)]

Thanks. Hopefully Milan can triage this further.

Comment 5

[Milan Sreckovic [:milan] (needinfo for best results)]

This is specific to Apple's CG backend.  The underlying cause seems to be a really long page that sets up the gradient to be dependent on the length of the page, so it seems CG just doesn't work in that case.

As we reuse the tiles without clearing (performance reasons), and CG quietly fails, you get to see the old results.  You can see Safari failing to produce the gradient (Safari uses CG) as well.

We stopped using CG with 48, so this problem should be gone in the latest Firefox Beta and newer.

Comment 6

[Milan Sreckovic [:milan] (needinfo for best results)]

We can call this fixed by bug 1207332, where we switched away from CG to Skia backends.

Comment 7

[:Gijs (he/him)]

(FWIW, I tested on beta (48) on OS X rather than release, so I can confirm it's fixed. :-) )