different audio speedup behavior between Linux and Windows through Firefox

[AnotherNeko]

note that I only use YouTube, I'm not sure how this issue affects other websites.

Firefox version on Windows: 101.0 (64-bit):

• behavior: speeding up the video past 4.0x speeds up the video as expected, but the audio goes mute past 8.0x speed.

Firefox version on Linux, Kubuntu 21.04: (I don't remember the version at the time of writng, but the behavior has been consistent over the past several months through several updates):

• behavior: speeding up the video works fine but the audio cuts of at 4.0x speed.

Steps to reproduce:

1. install Firefox on Windows through the Firefox website
2. (KUbuntu comes with Firefox installed, no need to install anything; probably can test this bug in a USB-booted environment)
3. on both Windows and KUbuntu, perform the following steps:
4. install Video Speed Controller extension
5. start watching a Youtube video
6. make sure the resolution is relatively low (720p, 480p) so that hardware limitations do not unintentionally lag the video
7. press d several times to speed up the video, and note at which speed does the audio cut off
8. press s several times to slow down the video; you can use Youtube's speed adjust to change the second digit from a 0 to a 5

My results:

Windows: audio works when 8.0 >= (video speed) >= 0.15 Linux: audio works when 4.0 >= (video speed) >= 0.25

my guess is that Windows Firefox has twice the range of speeds where audio works compared to Linux Firefox.