That's a feature. Websites should not have access to my clipboard.
> - no PWA mode (impossible to put an icon of a website to your homescreen, which will open the website without a browser UI)
That's a feature. Icons on my home screen should only ever be native applications. Use bookmarks for websites instead.
> - impossible to have keyboard shortcuts with Alt https://bugzilla.mozilla.org/show_bug.cgi?id=1568130
Just build a native app. It's literally what you want.