1012140 - Nightly hangs / freezes until "Unresponsive Script" while browsing Facebook pages by specific date

Status: RESOLVED WORKSFORME

(Core :: General, defect)

Description

[Brian Carpenter [:geeknik]]

Attachment: Script Warning

I'm using a dirty profile with the latest Nightly x64 build of Firefox (Built from https://hg.mozilla.org/mozilla-central/rev/2893f60d5903) which I know is probably a no-no for something like this, but it's an issue and not everyone is running a fresh install of Firefox w/ a clean profile. 

STR:

1) Login to Facebook
2) Go to https://www.facebook.com/NPR
3) On the right side of the page is a list of years (2014, 2013, 2012, etc). Click on 2014.
4) Click on April.
5) Browser hangs, can't scroll up/down, change tabs, etc.

Eventually, I get a script warning saying that https://fbstatic-a.akamaihd.net/rsrc.php/v2/y8/r/IS2hGhYk8t1.js:21 has stopped responding, etc. If I stop that script, Nightly becomes responsive again, at least to where I can change tabs, do other things, etc. Scrolling up/down on https://www.facebook.com/NPR is still painful.

I also tested in Safe Mode w/ all add-ons disabled and Nightly still hangs. The only difference is the script warning mentions https://fbstatic-a.akamaihd.net/rsrc.php/v2/y1/r/tnbpKpUiz_3.js:29.

Comment 1

[Brian Carpenter [:geeknik]]

Attachment: Nightly Profiler - Profile 1.json

I ran the Profiler while this was going on and here are the results.

Comment 2

[Boris Zbarsky [:bzbarsky]]

The profile just shows a bunch of site JS running...

_Does_ this happen in a clean profile, by any chance?  Is this a regression?

Comment 3

[Brian Carpenter [:geeknik]]

Clean profile with today's x64 Nightly on Windows 8.1 and yes, it still happens. Clean profile with today's x64 Nightly on Windows 7 SP1 and can't really reproduce it. Only differences besides the OS is the Windows 8.1 has an SSD in it and 24GB of RAM. The Windows 7 laptop has a mechanical drive and 16GB of RAM.

Comment 4

[Wayne Mery (:wsmwk)]

Brian do you stlil see this?

Comment 5

[Brian Carpenter [:geeknik]]

Can't repro this anymore.