I would like Firefox (the new super fast Quantum with low memory usage) to open some URLs in a special/popup window, i.e. almost without anything (toolbar, menu bar, tab bar, address bar, etc.) other than the web content.
At the moment I can only do something like this by clicking a link in an HTML file with the following code:
<a href="https://web.whatsapp.com/" target="popup" onclick="window.open('https://web.whatsapp.com/','popup', 'width=650,height=900');"> WhatsApp </a>
I wish I could do this by simply entering a command from terminal - or a standalone shell script would also do (ideally without the address bar, and positioned to the right and not left ;-)
Any suggestions or ideas please?