I notice the issue when I first open FF in the morning on Windows 7 Pro x64 machines. After that I cannot come up with a reliable way to reproduce this issue, other than it happens at random times throughout the day.

I do not notice this on Mac OSX 10.12 at all (we have a few of these). And I have not polled our Linux users on this issue, so I do not know where that stands.

Is there something in the dev tools that I can leave open when this happens again to try to narrow this down? I've had this happen several times today already.

jim


On 5/11/2017 11:51 AM, Phil Pishioneri wrote:
On 5/11/17 2:06 PM, Julien Cristau wrote:
we've filed a bug at https://bugzilla.mozilla.org/show_bug.cgi?id=1361865 to investigate the issue reported in this thread. Unfortunately so far we haven't been able to reproduce this internally. Does anyone on this thread have a reliable way to reproduce the problem you've seen? If this is also reproducible with the non-ESR Firefox releases, knowing which version introduced it would also help narrow down the search.

I've had very reproducible delays since (non-ESR) release 48. I found it related to syncing of my (large) bookmarks. Whenever the sync process starts (this can be "random", especially if a Firefox is active on another host syncing to the same account), Firefox's UI locks up for a few seconds. On a Mac, I get the spinning beach ball; on Windows, I'll get the window title bar message about the process not responding; I don't recall the behavior on Linux, other than Firefox becomes unresponsive. Creating a new bookmark also starts a sync (and, it'll start while the "Bookmark This Page" window is open).

My circumvention was to find the host name being used for my sync, and put in an override in my client's hosts file that maps the name to loopback 127.0.0.1, then commenting that out and manually starting a sync when I need it (then uncomment it again afterward).

My multiprocess status is off on all of these platforms due to incompatible extensions.

-Phil
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