1151572 - Loading a large gif prevents other images being displayed

Status: RESOLVED DUPLICATE of bug 1150089

(Core :: Graphics: ImageLib, defect)

Description

[Roman]

Open this gif in a clean Firefox profile: http://i.imgur.com/zaSxkLI.gif

It loads quickly as it's only 1MB, and starts playing. It does have a huge number of frames, but Firefox copes well so far.

Now open pretty much any other page with images in a new Firefox tab, e.g. the image search in Google. Some images will show, but most will never load. The page will likely never finish loading (the spinning icon keeps spinning).

Tested in current Firefox nightly and in 37.0.1, both in clean profiles. Sorry not sure which component to pick. Also not entirely sure it's a Core bug, but the Firefox components seemed even less relevant.

Comment 1

[Roman]

Also, not 100% sure if it's part of the same issue, but when in this state, I believe Firefox sometimes fails to show a modal dialog, but succeeds in blocking the main window, making in ding no matter where I click.

It certainly sounds like it's unlikely to be related, but during the 2 hours I spent hunting down the cause of the above (I have a lot of tabs and initially blamed extensions...), this modal ding thing occurred if and only if the image loading was broken.

Comment 2

[Y L]

I also meet the similar problem.
When I viewed a webpage (http://okceanz.tumblr.com) which contains many GIF images and scrolled down and down constantly, I suddenly found the browser don't load new images anymore! At the same time, the browser even couldn't load my big local images! But small images could still be opened in Firefox. And I have ensured this is a bug by using a new blank profile to test.
I'm using Firefox 37.0.1 (32 bit version) on Windows 7 Ultimate (64 bit).
Ps. Similar problem didn't happen to Firefox 36.0.4 either, I also made a new blank profile to test.

Comment 3

[Roman]

Moving to Firefox as there was no response from Core, maybe it was the wrong product.

This is 100% reproducible and happens in trunk as well as v37. Realised I've tested in 32-bits too, so platform reset to All.

Upping importance as I've started having other occurrences of images that stop working randomly, but this is a reliable way to trigger the bug. It's possible that it's the same bug.

Comment 4

[Boris Zbarsky [:bzbarsky]]

Core is the right place.... but General may not be.

Comment 5

[Seth Fowler [:seth] [:s2h]]

This is a known issue.