SUMMARY
widevineCDM Plugin in Firefox (preinstalled) keeps crashing.
(seems to be mainly KDE Neon going by quick Reddit search:
https://www.reddit.com/r/firefox/comments/zogp86/widevinecdm_crashing_constantly_on_linux/
https://www.reddit.com/r/Ubuntu/comments/zogq19/firefox_widevinecdm_crashing_constantly/
https://www.reddit.com/r/firefox/comments/111s42y/comment/j8k355q/?utm_source=share&utm_medium=web2x&context=3
)

STEPS TO REPRODUCE
Install KDE Neon user edition and open Netflix, Amazon Prime, TIDAL or almost any other paid media streaming service. Try to play Media.

OBSERVED RESULT
It will crash. (where do I get the crash info? on Redit someone said it was empty.)

EXPECTED RESULT
Media is played

SOFTWARE/OS VERSIONS

Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.0-1007-oem (64-bit) but also default 5.15 and 5.19
Graphics Platform: Wayland
Firefox: at least 109-111

Processors: 16 × 12th Gen Intel® Core™ i5-1240P
Memory: 15,3 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: Framework

ADDITIONAL INFORMATION

I also saw that Hardware decoding was disabled. This makes my fans spin up to max while only watching youtube. The snap package manages everything well. I think Hardware rendering is why some people on Reddit say flatpak is much faster. In my case Flatpak hat some Tearing-Issues.
(Sorry if this is the wrong place for the report. But it seems like the issue is some configuration problem in this package and mainly in KDE Neon)