Do you have that problem with Firefox crashing when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...

Also, it might be helpful for one of us to review the Crash Reports for your crashes.
https://support.mozilla.com/en-US/kb/Firefox+crashes#Getting_help_with_your_crash

Type about:crashes in the URL bar and hit Enter.
Click the hyperlinks to bring up the Crash Report pages and copy'n'paste the URL of each of those reports into the message box here. We'll see if we can help you figure out what is causing those crashes to happen.

It still exists in save mode. I also cannot sign in in mozill.com I have to use IE

Remove All Reports Submitted Crash Reports

I removed them all and tried it again to get into my yahoo account. I had happened again and all the reports were back. Perhaps it is helpful to know. I just remembered that one of my German accounts (mysc.de) was for 1 day down cause it was reported as a attacking site. Short after this crashing issue started. Don`t know what happened to them but it is not an attacking site and they fixed this problem. Funny thing about is now: this is now the only site I am able to get into.

I removed the reports again

       Report ID
       	Date Submitted
     

   bp-6a1c8d0f-b3e2-4054-846d-5ba1e2110117	1/17/2011	7:39 PM

bp-1a29abbd-7e5c-416b-80be-0451c2110117 1/17/2011 1:06 PM ce791836-365a-4a03-a848-5db00154bfa4 1/16/2011 10:07 PM d1ec3366-8524-43ad-9459-f10c1cf4da12 1/16/2011 9:46 PM ba4ffc1e-c969-48e7-a24d-abf96b6eb065 1/16/2011 9:23 PM a6d99ae0-6ebd-4c37-a204-b7d6a3caacd2 1/16/2011 9:15 PM 6bf2e3dd-7fe3-455d-b96e-ebe8fff5f8fc 1/16/2011 9:03 PM 374a9f96-a019-447f-9df9-2751b07fc3a0 1/16/2011 8:46 PM 1f48974a-0369-4819-9fc5-739c84751941 1/15/2011 9:07 PM bp-16e3cafe-fcba-486d-aaa6-eb3982110115 1/15/2011 2:03 PM bp-c8e7430f-b98b-4904-bd1e-fb2082110115 1/15/2011 10:37 AM bp-993b77e5-51e6-475c-9022-715092110114 1/14/2011 5:49 PM bp-b5a03e3a-206b-46d2-9693-4ce622110113 1/13/2011 7:34 PM bp-78012884-eab8-4912-897b-ddaac2110113 1/13/2011 6:00 PM bp-82728110-80a2-480f-b95d-95beb2110113 1/13/2011 3:19 PM bp-498bf218-a1f4-403e-8ab5-76b0f2110113 1/13/2011 1:42 PM bp-ac3b2497-6073-4029-b4da-b3b502110113 1/13/2011 12:37 PM bp-468f0e4b-9430-4b3a-ad68-1b3152110113 1/13/2011 12:27 PM bp-54792771-3cea-4a69-baec-472022110113 1/13/2011 11:54 AM bp-c1e52ad0-7e2f-43d7-937c-6874a2110113 1/13/2011 11:49 AM bp-c742f4bf-82f5-4025-84d3-1eb482110113 1/13/2011 11:48 AM bp-b5a1c5ec-df38-4c0a-bec1-3b30a2110113 1/13/2011 11:44 AM bp-dca274bb-646d-44c2-acb9-d303d2110112 1/12/2011 2:48 AM bp-843a00f7-83d8-43dc-8a93-bc5562110107 1/7/2011 10:30 PM bp-a0f4d9a5-8c42-4049-a12e-cd1422110107 1/7/2011 12:45 PM bp-4896d659-1905-4226-9522-ba1882110103 1/3/2011 4:14 PM bp-873b2c24-ed25-4186-8cb2-a040f2110102 1/3/2011 12:34 AM bp-65ada36d-1abc-4389-9d54-56cba2110102 1/2/2011 6:09 PM bp-aaa5ad67-870e-4371-8a2b-617962101229 12/29/2010 10:59 PM bp-4b0495fb-210f-4cda-97e7-459742101227 12/27/2010 2:47 AM bp-98e88f4b-b85b-4742-8ca9-097472101220 12/20/2010 1:25 PM bp-a7be144c-d04f-4647-9bb5-6ca1f2101219 12/19/2010 12:27 PM bp-bc6b4b4e-f6c1-443c-b584-b4b662101218 12/18/2010 11:57 PM bp-396803d1-57a3-4d2c-b1ab-a95ce2101216 12/17/2010 12:56 AM bp-56ba1204-c0c5-44d7-8e51-58e322101215 12/15/2010 2:44 PM bp-9f7adc5b-b743-492e-9fbe-cb96f2101214 12/14/2010 11:31 PM bp-97b79ea5-0a92-4b50-94fb-a6cf22101214 12/14/2010 7:52 PM bp-f0835ccf-5c85-4113-8e14-909c62101213 12/13/2010 1:38 PM bp-0c738928-a5c2-4845-9012-b48c02101210 12/11/2010 12:13 AM 6a31d766-0ecb-4431-b63b-3bc353c58464 12/10/2010 8:09 PM bp-65befa79-333e-47a7-89db-b32962101210 12/10/2010 1:46 PM bp-8432c88b-48d2-4f53-872d-cd0c12101209 12/9/2010 4:55 PM bp-9134c3c7-b85a-4026-b547-f0cf12101207 12/7/2010 2:24 AM bp-d0dfb056-0488-4a44-ae1a-ea43f2101206 12/6/2010 2:10 PM bp-8f28862c-899d-4b84-a4f3-b0f9c2101206 12/6/2010 8:54 AM bp-89ecf027-84cc-4a55-ba34-8992e2101205 12/6/2010 12:08 AM bp-89c164b4-0684-4df8-a804-1f7902101130 11/30/2010 4:18 AM bp-4761ddc6-6c3b-4719-8f33-465b12101129 11/29/2010 2:34 AM bp-b6cbe40f-ec82-480e-8b47-ec6dd2101121 11/21/2010 9:14 PM bp-141decd9-419f-43c7-9948-526202101119 11/20/2010 1:16 AM bp-cd836cc4-c0e6-4c2d-baa4-da3e22101116 11/16/2010 1:52 PM bp-2580d41e-d40e-41eb-a180-639bc2101112 11/12/2010 2:10 AM bp-2d734f84-11eb-47ed-87af-b3dd12101109 11/9/2010 2:07 AM bp-b3957e2d-2ce6-49f7-9b13-125aa2101105 11/5/2010 10:57 PM bp-20677245-7b76-4400-9c0e-e4fe92101102 11/2/2010 8:24 PM bp-f0bd56d7-fe2e-489d-868d-68be32101102 11/2/2010 5:20 PM bp-25a6c68b-5b8d-462b-863c-77de22101101 11/1/2010 3:03 PM bp-55c96f01-6e64-4815-a5c8-186052101101 11/1/2010 3:14 AM bp-ffce96bf-f802-4b01-abe0-263b82101030 10/30/2010 7:46 PM bp-4bdbc6fb-b77e-47e1-8d98-399682101030 10/30/2010 12:26 PM bp-9d43e4c4-c870-4487-98f1-a74412101030 10/30/2010 12:10 PM bp-d3f51b09-c261-4840-9b4f-f92d92101029 10/29/2010 11:22 PM bp-edb560b3-978a-4735-94d5-8505b2101027 10/28/2010 1:49 AM bp-94557724-f510-4e79-b942-584a42101019 10/19/2010 2:21 AM bp-07e10a48-457f-45e4-8e1a-8f9b12101016 10/17/2010 12:45 AM bp-0dae73ea-291b-42b3-af72-6f0d72101012 10/12/2010 2:38 PM bp-ade6e013-186a-4074-a861-687ad2101011 10/11/2010 5:22 PM bp-1523e373-40d3-4af5-8af6-0c0932101010 10/10/2010 5:17 PM bp-f445dc10-f980-4833-9009-200b62101006 10/6/2010 11:45 PM bp-85f85a2f-f447-4525-8794-f55242101004 10/4/2010 4:31 PM bp-327ca996-e454-4995-9a77-faf0d2101003 10/3/2010 6:24 PM bp-620dc704-099c-4fd3-a202-f3f9e2100926 9/26/2010 1:48 PM bp-5558d3d1-ee1b-4675-b59a-6d5e62100925 9/25/2010 1:58 PM bp-61091c88-ad96-473a-ad95-4ce962100924 9/24/2010 3:24 PM bp-c32b3753-f1f3-4482-85fe-22cdd2100922 9/22/2010 10:28 PM bp-ec7c393d-7a1b-4ef0-8063-7107a2100920 9/20/2010 2:39 PM bp-de228191-48d1-4f5e-8f25-ea4822100919 9/19/2010 7:56 PM bp-2cd19251-5cbf-4da3-ab71-73eed2100918 9/18/2010 4:18 PM bp-a0f4f357-73f7-45d9-8957-fb50e2100917 9/17/2010 12:33 PM bp-0a3a4deb-7c02-4095-8c4c-fa4fc2100912 9/12/2010 11:00 PM bp-2f83cdd9-02d3-4f30-8471-0200a2100911 9/11/2010 4:47 PM bp-987f8053-234a-45ce-9ea9-4658c2100910 9/10/2010 4:16 PM bp-52bdaf9e-9dcf-4fe6-86e7-c57b42100907 9/8/2010 12:19 AM bp-11d1085a-28a5-41fb-8f8c-845652100905 9/5/2010 2:17 PM bp-cabd99b3-c693-42e6-8c5c-d1a932100905 9/5/2010 2:16 PM bp-b433951d-c851-4dcf-b56b-fdccb2100905 9/5/2010 1:50 PM bp-c8a4a67f-ce6d-41a9-b077-c701f2100904 9/4/2010 12:01 PM bp-95446408-5099-43b3-bc7c-b61fd2100831 8/31/2010 12:49 PM bp-aa1cba0e-1423-45ed-aa97-18b1d2100825 8/25/2010 7:17 PM bp-ad580d86-9ce4-4f89-b7fa-487092100824 8/24/2010 12:27 PM bp-33976cd1-6228-4284-8f6e-4cab02100822 8/22/2010 10:28 PM bp-2a9dd7cc-1ed0-429f-8566-9cbe02100821 8/21/2010 11:16 PM bp-723dbac1-a97e-4490-9e41-4cb282100820 8/21/2010 12:30 AM bp-26ae35c1-287b-4bb4-9777-2648c2100818 8/18/2010 11:10 PM bp-9ccd3ebe-8d86-4847-b049-74cb02100818 8/18/2010 5:34 PM bp-925656c3-26cc-46de-a71c-73c4c2100818 8/18/2010 11:28 AM bp-0bb2d8cf-2151-498b-abd9-9310f2100818 8/18/2010 10:34 AM bp-fcb2c5ae-4a16-4360-a0a7-fb0972100809 8/9/2010 12:41 PM bp-05a3e658-d1fe-45e5-832d-78b502100805 8/5/2010 8:56 PM bp-ba8adaab-d2ce-45d3-80a0-c95eb2100703 7/3/2010 9:42 PM bp-ad8de86c-6602-4811-b70f-a2a322100627 6/28/2010 12:00 AM 676287db-df9c-498b-af0a-547027564700 6/25/2010 9:23 PM 37cab3f1-d93c-4056-8116-0cddd195460c 6/25/2010 9:23 PM 81783813-b163-4d0e-80fb-5a46b2e72edc 6/25/2010 9:23 PM 65f79435-912c-4163-b74e-d4d428b9f2de 6/25/2010 9:23 PM d05b471e-647e-46d2-b6ab-fed0da797232 6/25/2010 9:22 PM 9f070b6c-3add-4590-97d5-7f9254622b51 6/25/2010 9:22 PM d2146ac4-7531-435c-9447-8f57bd83dfc9 6/25/2010 9:22 PM 5c1145db-1185-4ce9-92c5-483fef305ef4 6/25/2010 9:21 PM 12c791ab-7cf9-4787-b957-168f577373c0 6/25/2010 9:21 PM 9f04a147-3bff-4297-b6eb-82304622f503 6/25/2010 9:21 PM 5d388405-fb33-410f-924a-a72d604d3fe1 6/25/2010 9:20 PM 95e366bf-2f32-4e97-b0a1-2e43ad5d6c7d 6/25/2010 9:20 PM bp-19243c23-3289-4fb3-a9cf-1b65f2100625 6/25/2010 7:35 PM 1a6b42d8-a83f-421d-81e8-72ab3aa88a72 6/22/2010 8:45 PM 76fced29-e0db-47ec-a456-7b11eb35c384 6/19/2010 9:56 PM b3994ef5-cf1f-4827-9642-ad38ab8de3a7 6/16/2010 2:46 PM 30525bc9-7193-4121-b6b0-205c0240a6af 6/13/2010 2:05 AM 6f1b10fe-d798-49ef-9386-413af00df763 6/11/2010 7:49 PM 8bf745ee-b423-4c77-b8af-44f9f1d55f32 6/9/2010 7:44 PM bp-41bdddd2-9b9e-4c57-8841-2f08e2100601 6/1/2010 11:09 PM bp-db543148-9482-47e1-89a2-cb82a2100601 6/1/2010 6:08 PM bp-f7db2389-3ada-43c8-bab7-a7edc2100530 5/30/2010 5:44 PM bp-fa6c5da2-f586-43b1-b2a4-5eb472100523 5/23/2010 3:10 PM bp-ae3fd2c5-4ae6-4c14-b358-6c3b62100504 5/4/2010 10:49 PM

No crash reports have been submitted.

This application has not been configured to display crash reports. The preference breakpad.reportURL must be set.