Ray Satiro Reporter
	Description • 9 years ago

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:38.0) Gecko/20100101 Firefox/38.0
Build ID: 20150212030231

Steps to reproduce:

Don't know.


Actual results:

Occasionally I will be viewing a webpage in e10s and firefox will freeze but only for a second. For example as I type this sometimes I can't see what I'm typing until a second later. Restarting Nightly fixes it.

Although I have just switched to x64 builds I had the same problem occasionally in x86 builds.

To measure responsiveness in Firefox I use a swirl graphic, https://i.imgur.com/BdRFZB6.gif , which is an animated GIF that continuously moves. Any break in the animation and I observe a momentary freeze in Firefox.

I have taken attached a video to contrast the difference. I have Nightly open and after the freezes start occurring I open two windows, one e10s on the left and one non-e10s on the right, and put the swirl gif on both. I then take the focus off either window. The video shows how the non-e10s window operates without incident but the e10s window has freezes.

My past experience has led me to believe this is some sort of interaction between e10s windows and plugin-container (see bug 1099497), however I can't be sure. I am not running any extensions or any plugins other than the default OpenH264 codec.

Rarely I have experienced a similar type of momentary freeze in earlier versions of Firefox before e10s was introduced, however it either went away or I restarted the browser. I'm sure I reported that but I can't find it here.


Expected results:

There should be none of these momentary delays regardless. They are blocking and stifle the user experience.

	Ray Satiro Reporter
	Comment 1 • 9 years ago

The attachment upload was unsuccessful because the size is too big. Instead I uploaded it here:
https://vid.me/FKrO
Freezes are about ~15sec and ~1m50sec in.

	David Parks [:handyman]
	Comment 2 • 9 years ago

I was easily able to reproduce the 50sec hang on my retina MBP.

	Loic
	Comment 3 • 9 years ago

(In reply to Ray Satiro from comment #0)

> Rarely I have experienced a similar type of momentary freeze in earlier
> versions of Firefox before e10s was introduced, however it either went away
> or I restarted the browser. I'm sure I reported that but I can't find it
> here.

There is bug 1065463 about random freezes of the UI with OMTC (likely since FF33), the user cannot right click anymore to browse a tab, left cliking or waiting a few seconds is enough to have the hand again.

	Ray Satiro Reporter
	Comment 4 • 9 years ago

(In reply to Loic from comment #3)
> (In reply to Ray Satiro from comment #0)
> 
> > Rarely I have experienced a similar type of momentary freeze in earlier
> > versions of Firefox before e10s was introduced, however it either went away
> > or I restarted the browser. I'm sure I reported that but I can't find it
> > here.
> 
> There is bug 1065463 about random freezes of the UI with OMTC (likely since
> FF33), the user cannot right click anymore to browse a tab, left cliking or
> waiting a few seconds is enough to have the hand again.

After your post I disabled OMTC to test what would happen.
layers.offmainthreadcomposition.enabled = false
Unfortunately, now several days later I encountered the problem again. I resumed from sleep just now and Firefox has those e10s specific freezes. I'm using build 20150219070749 38.0a1 (2015-02-19). I'm going to restart. If there's anything I can do the next time this happens please let me know.

	Ray Satiro Reporter
	Comment 5 • 9 years ago

I'm still having this problem and it's become quite annoying. OMTC has been disabled since my last post. Please let me know if there's anything else I can do.
gecko.buildID = 20150501030205
gecko.mstone = 40.0a1

	Ray Satiro Reporter
	Comment 6 • 9 years ago

gecko.buildID = 20150720030213
gecko.mstone = 42.0a1
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:42.0) Gecko/20100101 Firefox/42.0

For the last two weeks I've been using the build above with e10s windows. I stuck with it because I noticed something that I didn't notice in previous builds which is that it was running without momentary freezes. It's been open two weeks straight in Windows 7 x64 with no freezes and I haven't had to restart it despite numerous OS hibernations and soft sleeps. I don't know what changed but something did. Maybe it's something on my end, some website I'm no longer visiting? I don't know, I can't think of one.

I will eventually update Nightly but I thought it important to earmark this in case I later forget should things go south again.

	Jim Mathies [:jimm]
	Comment 7 • 9 years ago

Still running into this Ray?

	Ray Satiro Reporter
	Comment 8 • 9 years ago

For the last month I've been stuck using ESR but for August and September I don't recall it happening.

	Jim Mathies [:jimm]
	Comment 9 • 9 years ago

Thanks, if you see this again with e10s please reopen.