To boot a browser directly without the full desktop environment in Raspbian, you can use a lightweight window manager or set up the browser to run in kiosk mode at startup. Here's a concise guide:

1. Install Minimal Raspbian: Start with a minimal Raspbian installation to reduce overhead.

2. Install X Server and Browser:

   • Install Xorg (minimal X server): sudo apt-get install --no-install-recommends xserver-xorg
   • Install your preferred web browser (e.g., Chromium): sudo apt-get install --no-install-recommends chromium-browser

3. Configure Kiosk Mode:

   • Create a .xinitrc file in the home directory:

     nano ~/.xinitrc
     

   • Add the following to launch the browser in kiosk mode:

     #!/bin/sh
     xset -dpms  # disable DPMS (Energy Star) features
     xset s off  # disable screen saver
     xset s noblank  # don’t blank the video device
     exec chromium-browser --noerrdialogs --disable-infobars --kiosk 'http://localhost'  # adjust the URL as needed
     

4. Set X Server to Start at Boot:

   • Edit the rc.local file to start the X server with your configuration on boot:

     sudo nano /etc/rc.local
     

   • Add the following before exit 0:

     su -l pi -c startx &
     

   • Ensure your user (pi in this case) has the correct permissions to start X.

5. Reboot:

   • Reboot your Raspberry Pi to test the setup:

     sudo reboot
     

This setup will boot your Raspberry Pi into a browser in kiosk mode, bypassing the full desktop environment to save resources.