User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20170125094131 Steps to reproduce: I login to firefox Sync. Firefox crashes after a short time (< 1min). Firefox stable when sync is disabled by logging out Seen on two different computers - recent macbook pro and old macbook air Actual results: Crash ever since the update to maxos 10.12.3 (and ff51 the same day). Some examples ( I have others on other machines) bp-4369fbce-2443-49d2-8db8-6dd162170130 30/01/2017 07:39 bp-d7535680-9d06-462c-ae0e-2fb9c2170127 27/01/2017 21:33 bp-6aef5d72-0d19-42eb-a2ac-80b792170127 27/01/2017 21:32 bp-c4d350f2-1f20-43cb-8ef9-67c692170127 27/01/2017 21:22 bp-e45873e1-b907-42c4-9792-a15702170127 27/01/2017 21:20 bp-05b9b657-0835-4dfb-b8f4-739ce2170127 27/01/2017 21:19 bp-3f8bf146-8409-40bb-815c-eca9f2170127 27/01/2017 19:49 bp-a2db369f-a22f-425e-b4af-3c2ab2170127 27/01/2017 19:49 bp-6fb756e4-a082-413e-b1ea-eb74b2170127 27/01/2017 19:48 bp-f8f7eeb0-4a87-4ca5-8bb9-7dc5f2170127 27/01/2017 19:48 Expected results: No crash. Note: I re-installed a fresh firefox, + did a full refresh. Some of the crashes were without add-ons installed. Does not make a difference.

I've seen this kind of crash on macOS before, in https://bugzilla.mozilla.org/show_bug.cgi?id=1310554#c8. AM, do you have a lot of bookmarks?

I must have a few thousand bookmarks. However in the last days it crashes within minutes of every single use of firefox. This is new and makes the program unusable with sync on. Running without sync has been a revelation (I always have it on) -- firefox feels far far more responsive compared to what I am used to. Crash may well be linked to update to 10.12.3

Comment 1 implies this might be a database error in places.sqlite. That file has all your private history and bookmark information, but if you are willing to share this privately with one of us it might help narrow it down further. Seeing some sync logs [1] would also give us some insights. You could also try the "places maintenance" addon [2], which *might* repair the problem and let us proceed. [1] https://wiki.mozilla.org/CloudServices/Sync/File_a_desktop_bug [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1337321

My last sync error is over one month old, which is older than the instability. I tried FF52 and 54 I get crashes Going back to 49 all is stable again

(In reply to AM from comment #4) > My last sync error is over one month old, which is older than the > instability. > > I tried FF52 and 54 I get crashes > > Going back to 49 all is stable again This is almost certainly because we changed how Sync access places.sqlite, causing crashes in your profile. Please see comment 3 for a few things that might be able to help.

I cleaned with "places maintenance". And the desktop instance of firefox (ff52beta) became stable! Three hours later I opened my macbook (ff49), and the desktop copy crashed within seconds. It then regularly crashed every minute or so as before. bp-76bebedc-3698-40b9-8684-bb02d2170214 Rerunning maintenance, it became stable again. So it sounds a bit like a format incompatibility in the sync. I see that a new version of sqlite will added. So I will now become silent and see how it goes forwards. Nothing in about:sync-log Also I commented in bug 1309696. which I will use if I have anything further to add.