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Firefox hangs when I press XF86Calculator / XF86Mail (special Calculator/Mail buttons)

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I have a few special buttons on my keyboard (Calculator / Mail). I've set them (on lxde-rc.xml) to run a simple bash script (Volume up / down using pactl). Unfortunately, I've noticed that only on Firefox hangs when I press these buttons (tested with terminal/slack/IDEs/Chrome, no issues). It's a ~2 seconds hang that prevents me from doing anything (tried scrolling/typing/clicking, nothing).

Any way to see what is actually happening / disable this behavior?

I have a few special buttons on my keyboard (Calculator / Mail). I've set them (on ''lxde-rc.xml'') to run a simple bash script (Volume up / down using ''pactl''). Unfortunately, I've noticed that only on Firefox hangs when I press these buttons (tested with terminal/slack/IDEs/Chrome, no issues). It's a ~2 seconds hang that prevents me from doing anything (tried scrolling/typing/clicking, nothing). Any way to see what is actually happening / disable this behavior?