Didn't see your response until now, so if of use, I've just reproduced this on Windows with `Mozilla.Firefox_139.0.0.0_x64__n80bbvh6b1yt2`, too: > ~~~YAML > (9e0.300c): Access violation - code c0000005 (first chance) > First chance exceptions are reported before any exception handling. > This exception may be expected and handled. > xul!VR_RuntimePath+0x2ceccb: > 00007ffb`7ec36f6b 4d8b01 mov r8,qword ptr [r9] ds:00000000`00000000=???????????????? > 0:000> k > # Child-SP RetAddr Call Site > 00 00000043`e7bfa610 00007ffb`7ec36935 xul!VR_RuntimePath+0x2ceccb > 01 00000043`e7bfaa50 00007ffb`7ec39265 xul!VR_RuntimePath+0x2ce695 > 02 00000043`e7bfab20 00007ffb`7ec385c8 xul!VR_RuntimePath+0x2d0fc5 > 03 00000043`e7bfacb0 00007ffb`7ec05baa xul!VR_RuntimePath+0x2d0328 > 04 00000043`e7bfafa0 00007ffb`7f36a719 xul!VR_RuntimePath+0x29d90a > 05 00000043`e7bfb060 00007ffb`7c1f463a xul!VR_RuntimePath+0xa02479 > 06 00000043`e7bfb0d0 00007ffb`7ce8b069 xul!GIFFT_LabeledTimingDistributionStart+0x82c49a > 07 00000043`e7bfb190 00007ffb`7ce337bb xul!GIFFT_TimingDistributionAccumulateRawSample+0x205009 > 08 00000043`e7bfb560 00007ffb`7cfa666c xul!GIFFT_TimingDistributionAccumulateRawSample+0x1ad75b > 09 00000043`e7bfb7d0 00007ffb`7b778ef7 xul!GIFFT_TimingDistributionAccumulateRawSample+0x32060c > 0a 00000043`e7bfb8f0 00007ffb`7c42df32 xul!CrashReporter::SetRemoteExceptionHandler+0x2c5387 > 0b 00000043`e7bfba40 00007ffb`7c42f3a9 xul!GIFFT_LabeledTimingDistributionStart+0xa65d92 > 0c 00000043`e7bfbd10 00007ffb`7c42975c xul!GIFFT_LabeledTimingDistributionStart+0xa67209 > 0d 00000043`e7bfbf90 00007ffb`7b6da9f5 xul!GIFFT_LabeledTimingDistributionStart+0xa615bc > 0e 00000043`e7bfc550 00007ffb`7cc8bad9 xul!CrashReporter::SetRemoteExceptionHandler+0x226e85 > 0f 00000043`e7bfdeb0 00007ffb`7cc88f7c xul!GIFFT_TimingDistributionAccumulateRawSample+0x5a79 > 10 00000043`e7bfe230 00007ffb`7cc880f2 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2f1c > 11 00000043`e7bfe640 00007ffb`7cc55aa0 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2092 > 12 00000043`e7bfe6d0 00007ffb`7cc872c9 xul!GIFFT_LabeledTimingDistributionAccumulateRawMillis+0x500520 > 13 00000043`e7bfeab0 00007ffb`7b4a6f0f xul!GIFFT_TimingDistributionAccumulateRawSample+0x1269 > 14 00000043`e7bfece0 00007ffb`7b530262 xul!XRE_GetBootstrap+0x228f > 15 00000043`e7bfed30 00007ffb`7b52f30b xul!CrashReporter::SetRemoteExceptionHandler+0x7c6f2 > 16 00000043`e7bfeda0 00007ffb`7b5300f7 xul!CrashReporter::SetRemoteExceptionHandler+0x7b79b > 17 00000043`e7bfee00 00007ffb`7b4a6f0f xul!CrashReporter::SetRemoteExceptionHandler+0x7c587 > 18 00000043`e7bfee60 00007ffb`7b4a238b xul!XRE_GetBootstrap+0x228f > 19 00000043`e7bfeeb0 00007ff7`1f3f4a11 xul+0x3238b > 1a 00000043`e7bff1a0 00007ff7`1f427f58 firefox!TargetNtOpenKey64+0x2c51 > 1b 00000043`e7bffd80 00007ffc`8e38e8d7 firefox!TargetCreateThread+0x7418 > 1c 00000043`e7bffdc0 00007ffc`8eeffbcc KERNEL32!BaseThreadInitThunk+0x17 > 1d 00000043`e7bffdf0 00000000`00000000 ntdll!RtlUserThreadStart+0x2c > ~~~ I'll try [`nightly/latest-mozilla-central-l10n/Firefox%20Installer.en-GB.exe`](https://download-installer.cdn.mozilla.net/pub/firefox/nightly/latest-mozilla-central-l10n/#:~:text=29%2DMay%2D2025%2011:20-,File,29%2DMay%2D2025%2011:00,-File) next, since [it's not on `winget` anymore](https://github.com/microsoft/winget-pkgs/issues/87309#issuecomment-2558734434:~:text=it%20appears%20to%20have%20been%20removed%2C%20since%20Find%2DWinGetPackage%20'Firefox'%20%7C%20Select%2DString%20'Nightly'%20returns%20nothing.). 😔
Bug 1969259 Comment 3 Edit History
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Didn't see your response until now, so if of use, I've just reproduced this on Windows with `Mozilla.Firefox_139.0.0.0_x64__n80bbvh6b1yt2`, too: > ~~~YAML > (9e0.300c): Access violation - code c0000005 (first chance) > First chance exceptions are reported before any exception handling. > This exception may be expected and handled. > xul!VR_RuntimePath+0x2ceccb: > 00007ffb`7ec36f6b 4d8b01 mov r8,qword ptr [r9] ds:00000000`00000000=???????????????? > 0:000> k > # Child-SP RetAddr Call Site > 00 00000043`e7bfa610 00007ffb`7ec36935 xul!VR_RuntimePath+0x2ceccb > 01 00000043`e7bfaa50 00007ffb`7ec39265 xul!VR_RuntimePath+0x2ce695 > 02 00000043`e7bfab20 00007ffb`7ec385c8 xul!VR_RuntimePath+0x2d0fc5 > 03 00000043`e7bfacb0 00007ffb`7ec05baa xul!VR_RuntimePath+0x2d0328 > 04 00000043`e7bfafa0 00007ffb`7f36a719 xul!VR_RuntimePath+0x29d90a > 05 00000043`e7bfb060 00007ffb`7c1f463a xul!VR_RuntimePath+0xa02479 > 06 00000043`e7bfb0d0 00007ffb`7ce8b069 xul!GIFFT_LabeledTimingDistributionStart+0x82c49a > 07 00000043`e7bfb190 00007ffb`7ce337bb xul!GIFFT_TimingDistributionAccumulateRawSample+0x205009 > 08 00000043`e7bfb560 00007ffb`7cfa666c xul!GIFFT_TimingDistributionAccumulateRawSample+0x1ad75b > 09 00000043`e7bfb7d0 00007ffb`7b778ef7 xul!GIFFT_TimingDistributionAccumulateRawSample+0x32060c > 0a 00000043`e7bfb8f0 00007ffb`7c42df32 xul!CrashReporter::SetRemoteExceptionHandler+0x2c5387 > 0b 00000043`e7bfba40 00007ffb`7c42f3a9 xul!GIFFT_LabeledTimingDistributionStart+0xa65d92 > 0c 00000043`e7bfbd10 00007ffb`7c42975c xul!GIFFT_LabeledTimingDistributionStart+0xa67209 > 0d 00000043`e7bfbf90 00007ffb`7b6da9f5 xul!GIFFT_LabeledTimingDistributionStart+0xa615bc > 0e 00000043`e7bfc550 00007ffb`7cc8bad9 xul!CrashReporter::SetRemoteExceptionHandler+0x226e85 > 0f 00000043`e7bfdeb0 00007ffb`7cc88f7c xul!GIFFT_TimingDistributionAccumulateRawSample+0x5a79 > 10 00000043`e7bfe230 00007ffb`7cc880f2 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2f1c > 11 00000043`e7bfe640 00007ffb`7cc55aa0 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2092 > 12 00000043`e7bfe6d0 00007ffb`7cc872c9 xul!GIFFT_LabeledTimingDistributionAccumulateRawMillis+0x500520 > 13 00000043`e7bfeab0 00007ffb`7b4a6f0f xul!GIFFT_TimingDistributionAccumulateRawSample+0x1269 > 14 00000043`e7bfece0 00007ffb`7b530262 xul!XRE_GetBootstrap+0x228f > 15 00000043`e7bfed30 00007ffb`7b52f30b xul!CrashReporter::SetRemoteExceptionHandler+0x7c6f2 > 16 00000043`e7bfeda0 00007ffb`7b5300f7 xul!CrashReporter::SetRemoteExceptionHandler+0x7b79b > 17 00000043`e7bfee00 00007ffb`7b4a6f0f xul!CrashReporter::SetRemoteExceptionHandler+0x7c587 > 18 00000043`e7bfee60 00007ffb`7b4a238b xul!XRE_GetBootstrap+0x228f > 19 00000043`e7bfeeb0 00007ff7`1f3f4a11 xul+0x3238b > 1a 00000043`e7bff1a0 00007ff7`1f427f58 firefox!TargetNtOpenKey64+0x2c51 > 1b 00000043`e7bffd80 00007ffc`8e38e8d7 firefox!TargetCreateThread+0x7418 > 1c 00000043`e7bffdc0 00007ffc`8eeffbcc KERNEL32!BaseThreadInitThunk+0x17 > 1d 00000043`e7bffdf0 00000000`00000000 ntdll!RtlUserThreadStart+0x2c > ~~~ I'll try [`firefox-141.0a1.multi.win64.installer.msix`](https://ftp.mozilla.org/pub/firefox/nightly/latest-mozilla-central-l10n/#:~:text=29%2DMay%2D2025%2010:20-,File,29%2DMay%2D2025%2010:20,-File) next, since [it's not on `winget` anymore](https://github.com/microsoft/winget-pkgs/issues/87309#issuecomment-2558734434:~:text=it%20appears%20to%20have%20been%20removed%2C%20since%20Find%2DWinGetPackage%20'Firefox'%20%7C%20Select%2DString%20'Nightly'%20returns%20nothing.). 😔
Didn't see your response until now, so if of use, I've just reproduced this on Windows with `Mozilla.Firefox_139.0.0.0_x64__n80bbvh6b1yt2`, too: > ~~~YAML > (9e0.300c): Access violation - code c0000005 (first chance) > First chance exceptions are reported before any exception handling. > This exception may be expected and handled. > xul!VR_RuntimePath+0x2ceccb: > 00007ffb`7ec36f6b 4d8b01 mov r8,qword ptr [r9] ds:00000000`00000000=???????????????? > 0:000> k > # Child-SP RetAddr Call Site > 00 00000043`e7bfa610 00007ffb`7ec36935 xul!VR_RuntimePath+0x2ceccb > 01 00000043`e7bfaa50 00007ffb`7ec39265 xul!VR_RuntimePath+0x2ce695 > 02 00000043`e7bfab20 00007ffb`7ec385c8 xul!VR_RuntimePath+0x2d0fc5 > 03 00000043`e7bfacb0 00007ffb`7ec05baa xul!VR_RuntimePath+0x2d0328 > 04 00000043`e7bfafa0 00007ffb`7f36a719 xul!VR_RuntimePath+0x29d90a > 05 00000043`e7bfb060 00007ffb`7c1f463a xul!VR_RuntimePath+0xa02479 > 06 00000043`e7bfb0d0 00007ffb`7ce8b069 xul!GIFFT_LabeledTimingDistributionStart+0x82c49a > 07 00000043`e7bfb190 00007ffb`7ce337bb xul!GIFFT_TimingDistributionAccumulateRawSample+0x205009 > 08 00000043`e7bfb560 00007ffb`7cfa666c xul!GIFFT_TimingDistributionAccumulateRawSample+0x1ad75b > 09 00000043`e7bfb7d0 00007ffb`7b778ef7 xul!GIFFT_TimingDistributionAccumulateRawSample+0x32060c > 0a 00000043`e7bfb8f0 00007ffb`7c42df32 xul!CrashReporter::SetRemoteExceptionHandler+0x2c5387 > 0b 00000043`e7bfba40 00007ffb`7c42f3a9 xul!GIFFT_LabeledTimingDistributionStart+0xa65d92 > 0c 00000043`e7bfbd10 00007ffb`7c42975c xul!GIFFT_LabeledTimingDistributionStart+0xa67209 > 0d 00000043`e7bfbf90 00007ffb`7b6da9f5 xul!GIFFT_LabeledTimingDistributionStart+0xa615bc > 0e 00000043`e7bfc550 00007ffb`7cc8bad9 xul!CrashReporter::SetRemoteExceptionHandler+0x226e85 > 0f 00000043`e7bfdeb0 00007ffb`7cc88f7c xul!GIFFT_TimingDistributionAccumulateRawSample+0x5a79 > 10 00000043`e7bfe230 00007ffb`7cc880f2 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2f1c > 11 00000043`e7bfe640 00007ffb`7cc55aa0 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2092 > 12 00000043`e7bfe6d0 00007ffb`7cc872c9 xul!GIFFT_LabeledTimingDistributionAccumulateRawMillis+0x500520 > 13 00000043`e7bfeab0 00007ffb`7b4a6f0f xul!GIFFT_TimingDistributionAccumulateRawSample+0x1269 > 14 00000043`e7bfece0 00007ffb`7b530262 xul!XRE_GetBootstrap+0x228f > 15 00000043`e7bfed30 00007ffb`7b52f30b xul!CrashReporter::SetRemoteExceptionHandler+0x7c6f2 > 16 00000043`e7bfeda0 00007ffb`7b5300f7 xul!CrashReporter::SetRemoteExceptionHandler+0x7b79b > 17 00000043`e7bfee00 00007ffb`7b4a6f0f xul!CrashReporter::SetRemoteExceptionHandler+0x7c587 > 18 00000043`e7bfee60 00007ffb`7b4a238b xul!XRE_GetBootstrap+0x228f > 19 00000043`e7bfeeb0 00007ff7`1f3f4a11 xul+0x3238b > 1a 00000043`e7bff1a0 00007ff7`1f427f58 firefox!TargetNtOpenKey64+0x2c51 > 1b 00000043`e7bffd80 00007ffc`8e38e8d7 firefox!TargetCreateThread+0x7418 > 1c 00000043`e7bffdc0 00007ffc`8eeffbcc KERNEL32!BaseThreadInitThunk+0x17 > 1d 00000043`e7bffdf0 00000000`00000000 ntdll!RtlUserThreadStart+0x2c > ~~~ Though, since I now know that it's not platform-specific, I'll try [`firefox-141.0a1.multi.win64.installer.msix`](https://ftp.mozilla.org/pub/firefox/nightly/latest-mozilla-central-l10n/#:~:text=29%2DMay%2D2025%2010:20-,File,29%2DMay%2D2025%2010:20,-File) next (I'd use a reproducible installation method, but since [it's not on `winget` anymore](https://github.com/microsoft/winget-pkgs/issues/87309#issuecomment-2558734434:~:text=it%20appears%20to%20have%20been%20removed%2C%20since%20Find%2DWinGetPackage%20'Firefox'%20%7C%20Select%2DString%20'Nightly'%20returns%20nothing.), 😔 I can't.)
Didn't see your response until now, so if of use, I've just reproduced this on Windows with `Mozilla.Firefox_139.0.0.0_x64__n80bbvh6b1yt2`, too. I captured a dump, but it's 300 MiB, so I'll provide the trace unless you can't reproduce it yourself: > ~~~YAML > (9e0.300c): Access violation - code c0000005 (first chance) > First chance exceptions are reported before any exception handling. > This exception may be expected and handled. > xul!VR_RuntimePath+0x2ceccb: > 00007ffb`7ec36f6b 4d8b01 mov r8,qword ptr [r9] ds:00000000`00000000=???????????????? > 0:000> k > # Child-SP RetAddr Call Site > 00 00000043`e7bfa610 00007ffb`7ec36935 xul!VR_RuntimePath+0x2ceccb > 01 00000043`e7bfaa50 00007ffb`7ec39265 xul!VR_RuntimePath+0x2ce695 > 02 00000043`e7bfab20 00007ffb`7ec385c8 xul!VR_RuntimePath+0x2d0fc5 > 03 00000043`e7bfacb0 00007ffb`7ec05baa xul!VR_RuntimePath+0x2d0328 > 04 00000043`e7bfafa0 00007ffb`7f36a719 xul!VR_RuntimePath+0x29d90a > 05 00000043`e7bfb060 00007ffb`7c1f463a xul!VR_RuntimePath+0xa02479 > 06 00000043`e7bfb0d0 00007ffb`7ce8b069 xul!GIFFT_LabeledTimingDistributionStart+0x82c49a > 07 00000043`e7bfb190 00007ffb`7ce337bb xul!GIFFT_TimingDistributionAccumulateRawSample+0x205009 > 08 00000043`e7bfb560 00007ffb`7cfa666c xul!GIFFT_TimingDistributionAccumulateRawSample+0x1ad75b > 09 00000043`e7bfb7d0 00007ffb`7b778ef7 xul!GIFFT_TimingDistributionAccumulateRawSample+0x32060c > 0a 00000043`e7bfb8f0 00007ffb`7c42df32 xul!CrashReporter::SetRemoteExceptionHandler+0x2c5387 > 0b 00000043`e7bfba40 00007ffb`7c42f3a9 xul!GIFFT_LabeledTimingDistributionStart+0xa65d92 > 0c 00000043`e7bfbd10 00007ffb`7c42975c xul!GIFFT_LabeledTimingDistributionStart+0xa67209 > 0d 00000043`e7bfbf90 00007ffb`7b6da9f5 xul!GIFFT_LabeledTimingDistributionStart+0xa615bc > 0e 00000043`e7bfc550 00007ffb`7cc8bad9 xul!CrashReporter::SetRemoteExceptionHandler+0x226e85 > 0f 00000043`e7bfdeb0 00007ffb`7cc88f7c xul!GIFFT_TimingDistributionAccumulateRawSample+0x5a79 > 10 00000043`e7bfe230 00007ffb`7cc880f2 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2f1c > 11 00000043`e7bfe640 00007ffb`7cc55aa0 xul!GIFFT_TimingDistributionAccumulateRawSample+0x2092 > 12 00000043`e7bfe6d0 00007ffb`7cc872c9 xul!GIFFT_LabeledTimingDistributionAccumulateRawMillis+0x500520 > 13 00000043`e7bfeab0 00007ffb`7b4a6f0f xul!GIFFT_TimingDistributionAccumulateRawSample+0x1269 > 14 00000043`e7bfece0 00007ffb`7b530262 xul!XRE_GetBootstrap+0x228f > 15 00000043`e7bfed30 00007ffb`7b52f30b xul!CrashReporter::SetRemoteExceptionHandler+0x7c6f2 > 16 00000043`e7bfeda0 00007ffb`7b5300f7 xul!CrashReporter::SetRemoteExceptionHandler+0x7b79b > 17 00000043`e7bfee00 00007ffb`7b4a6f0f xul!CrashReporter::SetRemoteExceptionHandler+0x7c587 > 18 00000043`e7bfee60 00007ffb`7b4a238b xul!XRE_GetBootstrap+0x228f > 19 00000043`e7bfeeb0 00007ff7`1f3f4a11 xul+0x3238b > 1a 00000043`e7bff1a0 00007ff7`1f427f58 firefox!TargetNtOpenKey64+0x2c51 > 1b 00000043`e7bffd80 00007ffc`8e38e8d7 firefox!TargetCreateThread+0x7418 > 1c 00000043`e7bffdc0 00007ffc`8eeffbcc KERNEL32!BaseThreadInitThunk+0x17 > 1d 00000043`e7bffdf0 00000000`00000000 ntdll!RtlUserThreadStart+0x2c > ~~~ Though, since I now know that it's not platform-specific, I'll try [`firefox-141.0a1.multi.win64.installer.msix`](https://ftp.mozilla.org/pub/firefox/nightly/latest-mozilla-central-l10n/#:~:text=29%2DMay%2D2025%2010:20-,File,29%2DMay%2D2025%2010:20,-File) next (I'd use a reproducible installation method, but since [it's not on `winget` anymore](https://github.com/microsoft/winget-pkgs/issues/87309#issuecomment-2558734434:~:text=it%20appears%20to%20have%20been%20removed%2C%20since%20Find%2DWinGetPackage%20'Firefox'%20%7C%20Select%2DString%20'Nightly'%20returns%20nothing.), 😔 I can't.)