Install Whatsapp Web on Linux

1. Create file /usr/share/applications/whatsapp-webapp.desktop
<<<<
#!/usr/bin/env xdg-open
[Desktop Entry]
Name=WhatsApp
GenericName=WhatsApp
Comment=WhatsApp desktop webapp
#Exec=webapp-container --store-session-cookies --webappUrlPatterns=https?://*.whatsapp.com/* --user-agent-string='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36 Edg/85.0.564.44' https://web.whatsapp.com %u
Exec=/opt/google/chrome/google-chrome --app=https://web.whatsapp.com/
Terminal=false
Type=Application
StartupNotify=true
MimeType=text/plain;
# If you want icon, type path of icon
Icon=/home/aji/.WhatsApp.svg
Categories=Network;Application;
Keywords=WhatsApp;webapp;
X-Ubuntu-Gettext-Domain=WhatsApp
StartupWMClass=web.whatsapp.com

2. Install Google Chrome

3. Download Whatsapp logo from wiki and save to 
https://upload.wikimedia.org/wikipedia/commons/6/6b/WhatsApp.svg
/home/aji/.WhatsApp.svg

4. Execute 
bash -c "wmctrl -xa web.whatsapp.com || /opt/google/chrome/google-chrome --app=https://web.whatsapp.com/"