the answer I found inside the file /usr/lib/x86_64-linux-gnu/opera-developer/resources/widevine_config.json. I saw that vivaldi opened the spotfy webplayer without any problems, so I looked in the browser folders for the folder that the opera file directed. After finding vivaldi's WidevineCdm folder, I created the following directory in - /opt/google/chrome/ - after that I went to - /var/opt/vivaldi - and copied the WidevineCdm folder into - /opt/google/chrome / -. I closed the opera and opened it again and everything went smoothly
Just about to report an issue with Opera beta 71, which is unusable when resuming from a suspend with Mint 20 and the recommended proprietary NVIDIA driver. The displayed page and user interface are garbled or blacked out. With beta 70 just the page was garbled, and fixable with a refresh. There doesn't seem to be a problem with the open source driver, but I don't yet know how video playback etc. will be affected.
@lu-menard It's a site issue. It's sending only the Flash based version of the video player to Opera (and Firefox as it seems).
Try disabling Flash at all on settings. Even better, try uninstalling it if don't still need it.
@nadavatar64 I'm a noob at Linux, but from some quick googling, it turns out that MATE is a continuation of Gnome 2, so maybe it's just Gnome. I'll try running a vm using a different de.
Edit : Actually, it seems to be a issue with snap. I installed Discord with snap and when uploading files, it also shows squares.