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[GH-ISSUE #6788] qutebrowser: no image preview on reddit #3371

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opened 2026-05-05 09:56:50 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 09:56:50 -06:00

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Originally created by @iskander9908 on GitHub (Jun 18, 2025).
Original GitHub issue: https://github.com/netblue30/firejail/issues/6788

Description

No image preview in qutebrowser at reddit.

Steps to Reproduce

firejail qutebrowser

Expected behavior

Image view at all sites

Actual behavior

No image view at reddit

Behavior without a profile

Everything works correctly.

Log

Output of LC_ALL=C firejail /path/to/program

 LC_ALL=C firejail qutebrowser 
Reading profile /etc/firejail/qutebrowser.profile
Reading profile /etc/firejail/allow-bin-sh.inc
Reading profile /etc/firejail/allow-python2.inc
Reading profile /etc/firejail/allow-python3.inc
Reading profile /etc/firejail/disable-common.inc
Reading profile /etc/firejail/disable-devel.inc
Reading profile /etc/firejail/disable-exec.inc
Reading profile /etc/firejail/disable-interpreters.inc
Reading profile /etc/firejail/disable-programs.inc
Reading profile /etc/firejail/disable-shell.inc
Reading profile /etc/firejail/whitelist-common.inc
Reading profile /etc/firejail/whitelist-run-common.inc
Reading profile /etc/firejail/whitelist-runuser-common.inc
Reading profile /etc/firejail/whitelist-usr-share-common.inc
Reading profile /etc/firejail/whitelist-var-common.inc
firejail version 0.9.74

Seccomp list in: !chroot,!name_to_handle_at, check list: @default-keep, prelist: unknown,unknown,
Parent pid 23031, child pid 23035
Warning: An abstract unix socket for session D-BUS might still be available. Use --net or remove unix from --protocol set.
Private /etc installed in 35.79 ms
Warning: /sbin directory link was not blacklisted
Warning: /usr/sbin directory link was not blacklisted
Base filesystem installed in 72.89 ms
Seccomp list in: !chroot,!name_to_handle_at, check list: @default-keep, prelist: unknown,unknown,
Child process initialized in 189.14 ms
Warning: an existing sandbox was detected. /usr/bin/qutebrowser will run without any additional sandboxing features
16:02:01 WARNING: Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switchedDetected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
 to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
[29:66:0618/160202.284168:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /run/firejail/mnt/dbus/system: Permission denied
[148:24:0618/160222.274661:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1
[148:24:0618/160222.414640:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1

Relates to:

#6786

Originally created by @iskander9908 on GitHub (Jun 18, 2025). Original GitHub issue: https://github.com/netblue30/firejail/issues/6788 ### Description No image preview in qutebrowser at reddit. ### Steps to Reproduce firejail qutebrowser ### Expected behavior Image view at all sites ### Actual behavior No image view at reddit ### Behavior without a profile Everything works correctly. ### Log <details> <summary>Output of <code>LC_ALL=C firejail /path/to/program</code></summary> <p> ``` LC_ALL=C firejail qutebrowser Reading profile /etc/firejail/qutebrowser.profile Reading profile /etc/firejail/allow-bin-sh.inc Reading profile /etc/firejail/allow-python2.inc Reading profile /etc/firejail/allow-python3.inc Reading profile /etc/firejail/disable-common.inc Reading profile /etc/firejail/disable-devel.inc Reading profile /etc/firejail/disable-exec.inc Reading profile /etc/firejail/disable-interpreters.inc Reading profile /etc/firejail/disable-programs.inc Reading profile /etc/firejail/disable-shell.inc Reading profile /etc/firejail/whitelist-common.inc Reading profile /etc/firejail/whitelist-run-common.inc Reading profile /etc/firejail/whitelist-runuser-common.inc Reading profile /etc/firejail/whitelist-usr-share-common.inc Reading profile /etc/firejail/whitelist-var-common.inc firejail version 0.9.74 Seccomp list in: !chroot,!name_to_handle_at, check list: @default-keep, prelist: unknown,unknown, Parent pid 23031, child pid 23035 Warning: An abstract unix socket for session D-BUS might still be available. Use --net or remove unix from --protocol set. Private /etc installed in 35.79 ms Warning: /sbin directory link was not blacklisted Warning: /usr/sbin directory link was not blacklisted Base filesystem installed in 72.89 ms Seccomp list in: !chroot,!name_to_handle_at, check list: @default-keep, prelist: unknown,unknown, Child process initialized in 189.14 ms Warning: an existing sandbox was detected. /usr/bin/qutebrowser will run without any additional sandboxing features 16:02:01 WARNING: Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8. Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead. If this causes problems, reconfigure your locale. See the locale(1) manual for more information. Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8. Qt depends on a UTF-8 locale, and has switchedDetected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8. Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead. If this causes problems, reconfigure your locale. See the locale(1) manual for more information. to "C.UTF-8" instead. If this causes problems, reconfigure your locale. See the locale(1) manual for more information. [29:66:0618/160202.284168:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /run/firejail/mnt/dbus/system: Permission denied [148:24:0618/160222.274661:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1 [148:24:0618/160222.414640:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1 ``` </p> </details> Relates to: * #6786

gitea-mirror added the

needinfo

label 2026-05-05 09:56:50 -06:00

gitea-mirror commented

2026-05-05 09:56:52 -06:00

Author

Owner

@kmk3 commented on GitHub (Jun 19, 2025):

Basic debugging information is missing; please follow the bug report template:

https://github.com/netblue30/firejail/issues/new?template=bug_report.md

 LC_ALL=C firejail qutebrowser

Make sure to use the full path to avoid issues with firejail-in-firejail (see
#2877).

Example:

LC_ALL=C firejail /usr/bin/qutebrowser

No image preview in qutebrowser at reddit.

Does it work on any other website?

[148:24:0618/160222.274661:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1
[148:24:0618/160222.414640:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1

What image format is that?

Post one image example.

You can try commenting lines in the profile to see which lines are causing the
issue.

@kmk3 commented on GitHub (Jun 19, 2025): Basic debugging information is missing; please follow the bug report template: * <https://github.com/netblue30/firejail/issues/new?template=bug_report.md> > ``` > LC_ALL=C firejail qutebrowser > ``` Make sure to use the full path to avoid issues with firejail-in-firejail (see #2877). Example: ``` LC_ALL=C firejail /usr/bin/qutebrowser ``` > No image preview in qutebrowser at reddit. Does it work on any other website? > ``` > [148:24:0618/160222.274661:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1 > [148:24:0618/160222.414640:ERROR:ffmpeg_common.cc(1046)] Unsupported pixel format: -1 > ``` What image format is that? Post one image example. You can try commenting lines in the profile to see which lines are causing the issue.

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Reference: github-starred/firejail#3371

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