[Nexus 4 Android Development] something123:
First time debugging Android, if the information you need is not here just ask and I can try to find it.

It was working before I updated to latest build. Firefox blankscreen on 20160905:

--------- beginning of crash
[ 09-05 21:47:26.504 1855: 1884 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 1884 (Gecko)

[ 09-05 21:47:26.535 1855: 1884 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:26.586 517: 627 I/chatty ]
uid=1000(system) Thread-4 expire 9 lines

[ 09-05 21:47:26.591 517: 535 I/chatty ]
uid=1000(system) FileObserver expire 10 lines

[ 09-05 21:47:27.185 1889: 1929 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 1929 (Gecko)

[ 09-05 21:47:27.209 1889: 1929 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:27.846 1932: 1949 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 1949 (Gecko)

[ 09-05 21:47:27.872 1932: 1949 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:28.478 1956: 1983 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 1983 (Gecko)

[ 09-05 21:47:28.503 1956: 1983 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:29.144 1985: 2023 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2023 (Gecko)

[ 09-05 21:47:29.171 1985: 2023 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:29.832 2026: 2051 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2051 (Gecko)

[ 09-05 21:47:29.870 2026: 2051 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:30.552 2053: 2095 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2095 (Gecko)

[ 09-05 21:47:30.600 2053: 2095 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:31.312 2098: 2127 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2127 (Gecko)

[ 09-05 21:47:31.336 2098: 2127 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:31.924 2129: 2170 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2170 (Gecko)

[ 09-05 21:47:31.956 2129: 2170 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:32.641 2175: 2223 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2223 (Gecko)

[ 09-05 21:47:32.683 2175: 2223 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-05 21:47:32.759 517: 2231 I/chatty ]
uid=1000 system_server expire 2 lines

[ 09-06 13:55:43.072 14376:14399 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-06 13:55:43.077 517: 530 W/ActivityManager ]
Activity pause timeout for ActivityRecord{96d0bd2 u0 org.mozilla.firefox/.App t13}

[ 09-06 13:55:43.088 517: 803 I/ActivityManager ]
Process org.mozilla.firefox (pid 14376) has died

[ 09-06 13:55:43.103 517: 803 I/ActivityManager ]
Start proc 14401:org.mozilla.firefox/u0a84 for activity org.mozilla.firefox/.App

[ 09-06 13:55:43.122 14400:14400 E/DEBUG ]
unexpected waitpid response: n=14399, status=00000000

[ 09-06 13:55:43.123 14400:14400 E/ ]
debuggerd: timed out waiting for signal

[ 09-06 13:55:43.123 517: 627 W/ ]
Couldn't find ProcessRecord for pid 14376

[ 09-06 13:55:43.124 14400:14400 E/ ]
debuggerd: ptrace detach from 14399 failed: No such process

[ 09-06 13:55:43.124 14400:14400 E/ ]
debuggerd: failed to kill process 14376: No such process

[ 09-06 13:55:43.128 170: 170 W/ ]
debuggerd: resuming target 14376

[ 09-06 13:55:43.132 517: 535 I/BootReceiver ]
Copying /data/tombstones/tombstone_04 to DropBox (SYSTEM_TOMBSTONE)

[ 09-06 13:55:43.305 14401:14401 I/art ]
Starting a blocking GC AddRemoveAppImageSpace

[ 09-06 13:55:43.331 1086:14406 D/DropBoxEntryAddedChimeraService ]
User is not opted-in to Usage & Diagnostics or Lockbox.

[ 09-06 13:55:43.378 14401:14401 I/GeckoApplication ]
zerdatime 15572493 - Fennec application start

[ 09-06 13:55:43.632 14401:14418 D/GeckoSharedPrefs ]
Current version = 1, prefs version = 1

[ 09-06 13:55:43.709 14401:14421 D/GeckoLoader ]
Gecko environment env0: null

[ 09-06 13:55:43.722 14401:14421 E/GeckoLibLoad ]
Load sqlite start

[ 09-06 13:55:43.725 14401:14421 F/libc ]
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 14421 (Gecko)

[ 09-06 13:55:43.725 170: 170 W/ ]
debuggerd: handling request: pid=14401 uid=10084 gid=10084 tid=14421

[ 09-06 13:55:43.760 14401:14421 F/libc ]
failed to resend signal during crash: Operation not permitted

[ 09-06 13:55:43.775 517: 530 W/ActivityManager ]
Activity pause timeout for ActivityRecord{96d0bd2 u0 org.mozilla.firefox/.App t13}

[ 09-06 13:55:43.790 517: 803 I/ActivityManager ]
Process org.mozilla.firefox (pid 14401) has died

[ 09-06 13:55:43.803 517: 803 I/ActivityManager ]
Start proc 14423:org.mozilla.firefox/u0a84 for activity org.mozilla.firefox/.App

[ 09-06 13:55:43.810 14422:14422 E/DEBUG ]
unexpected waitpid response: n=14421, status=00000000

[ 09-06 13:55:43.810 14422:14422 E/ ]
debuggerd: timed out waiting for signal

[ 09-06 13:55:43.810 517: 627 W/ ]
Couldn't find ProcessRecord for pid 14401

[ 09-06 13:55:43.810 14422:14422 E/ ]
AM eod write failed: Broken pipe

[ 09-06 13:55:43.810 14422:14422 E/ ]
debuggerd: ptrace detach from 14421 failed: No such process

[ 09-06 13:55:43.810 14422:14422 E/ ]
debuggerd: failed to kill process 14401: No such process