This is for 20.0.1387.64:
- File > Close Window
- Edit > Paste and Match Style
- View > Encoding
- View > Force reload this Page (!)
And most importantly, the Next and Previous Tab menu items are missing in the Window menu and can therefore not be remapped (System Preferences Keyboard > Shortcuts). This and the missing bookmarks and settings import tool precents me and surely many others from switching to Opera.