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Sometimes you want to send a message to a new number with the link web.whatsapp.com/send?phone=1213456 and you can't do that with the sidebar Whatsapp app button, you have to open a new tab and then go back,
it's a small request but I think most peope will make use of it.
Whatsapp custom URL button
A small button to enter a custom URL (for instance web.whatsapp.com/send?phone=1234) so you can send messages to new phones.
Images
"Search on google" right click option, to perform a reverse image search
Google account integration
Small button at the top left with links to Gmail, Google Drive, Maps, etc. from your connected google account.
Auto hide sidebar
Similar to windows task bar, when mouse touches the edge, the sidebar comes up, if not, it hides.