Add an option to disable typing sounds, as it can be distracting and I can't see an existing option anywhere.
Some websites autoplay videos and the video is forced into the corner of my screen with no option to get rid of it, even after the video has finished.
Opera GX doesn't remember the icons of bookmarks when you transfer them over. Unless I'm remembering wrongly, Firefox does it.
You can get rid of the sidebar, but I wish there was an option for it to act like a taskbar. Hover over the left side of the screen and allow it to pop out and become visible, just like the Windows taskbar does.
Youtube Music has a couple of bugs. If you try to full-screen a music video, the entire browser turns to fullscreen mode despite only the sidebar being affected. As well as that, if you minimise the video player, it glitches in and out of the thumbnails behind it.