Upload crashes happen at the point of selecting to browse for a file. Downloads happen whatever method to download. I have tried all the troubleshooting tips on Mozilla Support. These crashes happen in Safe Mode too. eg. bp-09ae6f93-4653-4014-ba5d-2e9ee2161119 19/11/2016 21:55 bp-273b2e74-f702-495d-8f32-2ade52161119 19/11/2016 21:47 bp-189678bb-fb09-4808-99ce-409b62161119 19/11/2016 21:40 bp-3479bd12-a7d2-4903-9c2e-30f1e2161119 19/11/2016 21:37 bp-ed8f6e85-1bef-4adf-94ba-7bc7b2161119 19/11/2016 21:31 bp-46516d9f-3564-408f-a424-16d462161119 19/11/2016 21:27 bp-03d0b6c5-b4e6-41dd-b81c-4b6fa2161119 19/11/2016 20:21 bp-14b17840-0922-490e-9814-c723a2161119 19/11/2016 12:11 bp-c25a65dc-1600-4094-8a4b-25eed2161118 18/11/2016 04:50 bp-2899d144-b3c6-48fa-b5b7-5e9782161117 17/11/2016 02:17 bp-6aebd31c-0163-4060-9342-e106d2161112 12/11/2016 18:09 bp-56452437-e67c-4197-9d3f-7a0b82161112 12/11/2016 13:53 bp-ecf2aa58-7eaf-4e9c-8a2c-744812161110 10/11/2016 15:45 bp-595ac4a8-895f-49b2-9935-cbe962161108 08/11/2016 03:35 bp-ce07b6d1-283b-4329-a057-c588a2161108 08/11/2016 02:15 bp-1be6031f-dcd7-4c11-bf7d-93d162161108 08/11/2016 02:09 I would be grateful for advice. Thank you.