This morning I updated firefox-developer-edition and its codecs packages, and it started behaving in a strange manner (the window resizing with frayed edges like the screen is broken and then jumping back at its place).
I tried running it from terminal and this is the output:
firefox-developer-edition 127 ✘
[GFX1-]: glxtest: VA-API test failed: failed to initialise VAAPI connection.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
[2022-12-14T09:52:10Z ERROR glean_core::metrics::ping] Invalid reason code startup for ping background-update
[fluent] Missing message in locale en-US:
[fluent] Couldn't find a message:
[dom/l10n] Errors during l10n mutation frame.
[fluent] Missing message in locale en-US:
[fluent] Couldn't find a message:
[dom/l10n] Errors during l10n mutation frame.
[fluent] Missing message in locale en-US:
[fluent] Couldn't find a message:
[dom/l10n] Errors during l10n mutation frame.
~ [GFX1-]: glxtest: VA-API test failed: failed to initialise VAAPI connection.
ATTENTION: default value of option mesa_glthread overridden by environment.
[fluent] Missing message in locale en-US: refresh-profile-instead
[fluent] Couldn't find a message: refresh-profile-instead
[dom/l10n] Could not complete initial document translation.
[2022-12-14T10:04:21Z ERROR glean_core::metrics::ping] Invalid reason code startup for ping background-update
[2022-12-14T10:05:17Z ERROR viaduct::backend::ffi] Missing HTTP status
[2022-12-14T10:05:17Z ERROR viaduct::backend::ffi] Missing HTTP status
hostnamectl
Static hostname: ec77-hp
Icon name: computer-laptop
Chassis: laptop 💻
Machine ID: 06dda19109894f42961c6c01899f98c9
Boot ID: 869ed5cd17cb428c94551fd29896cb0f
Operating System: Manjaro Linux
Kernel: Linux 6.0.11-1-MANJARO
Architecture: x86-64
Hardware Vendor: HP
Hardware Model: HP 250 G6 Notebook PC
Firmware Version: F.52
I am including system info to give some context.
Note that this is a very recent install and it has worked correctly until the update.
Thanks for the help and advice.
Elisabetta