Windows 8.1 & Firefox, Internet streams doesnt work anymore after slim

[govo1995]

I removed with ntlite all the metro stuff inclusive metro core. Now firefox doesnt start a stream anymore. It says no compatible source found. Only Youtube works.
Other Browsers (chromium) work without problem but i want to stick with firefox.
Does Firefox needs the metro core?
Im using Firefox version 60ESR.
Re-installed it & and tried a non ESR version. Same Problem

 

[Kasual]

Would be good if you upload the autosaved preset but probably Firefox needs an Addon.

 

[nuhi]

I removed with ntlite all the metro stuff inclusive metro core. Now firefox doesnt start a stream anymore. It says no compatible source found. Only Youtube works.
Other Browsers (chromium) work without problem but i want to stick with firefox.
Does Firefox needs the metro core?
Im using Firefox version 60ESR.
Re-installed it & and tried a non ESR version. Same Problem

What page is a "stream" so I can test it?
Since Youtube works, that may mean the other page is using the Adobe Flash?
And attach the preset with the removed components list.

Thanks.