Confetti Camouflage

You should try the Shimmer userchrome tweaks along with the Sideberry extension. With both of them it’s even better than Zen IMO.

A compatibility layer like Wine is not a replacement for a true sandbox. Although Wine may have some basic sandboxing capabilities, the default wine configuration grants access to your home directory, which something like ransomware could take advantage of.

WatchParty works fine for watching YouTube together but uploading to your friends requires Chrome. I’ve also never been able to get video working with mkv files. Webm works but I’ve never seen a release in a webm container.