Interesting, I have problems sometimes with FireFox and sound but I guess this could happen with video on certain setup.
Try using Chrome/Chromium only, and maybe uninstallaing FireFox if you think it could be an ingredient in the problematic.
For Minecraft, I have not used it for years and that was in Windows. Even then, it was using Java and wasn't really stable.
I guess it could be possible it leaves some process open in the background or something.
The following is coming from the noob-side
:
In any case, when using CTRL-ALT-F2, this usually change desktops if I'm not mistaken (I only use one so I'm not sure).
But, I think you have to enable multiple Workspaces for it to work (?) . Maybe you know more on this then me though, lol.
Edit : Typozzz
Try using Chrome/Chromium only, and maybe uninstallaing FireFox if you think it could be an ingredient in the problematic.
For Minecraft, I have not used it for years and that was in Windows. Even then, it was using Java and wasn't really stable.
I guess it could be possible it leaves some process open in the background or something.
The following is coming from the noob-side

In any case, when using CTRL-ALT-F2, this usually change desktops if I'm not mistaken (I only use one so I'm not sure).
But, I think you have to enable multiple Workspaces for it to work (?) . Maybe you know more on this then me though, lol.
Edit : Typozzz
- TheDead (TheUxNo0b)
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If my blabbering was helpful, please click my [Thank] link.