View Page Source Facebook Jun 2026

Press Option + Command + U (or Cmd + U for Firefox).

A frame appeared in the network log. It was binary, encoded in TWebSocket protocol. Elias right-clicked and selected 'Decode'. view page source facebook

He dug deeper, past the layout logic, looking for the communication layer. He knew Facebook used a system called MQTT or WebSocket for real-time chat. He wanted to see if he could see the "Seen" status trigger before the UI updated. Press Option + Command + U (or Cmd + U for Firefox)

The Ultimate Guide to Viewing Facebook Page Source Whether you are a developer debugging a script, a marketer hunting for a numeric ID, or a curious user wanting to see how the world’s largest social network is built, knowing how to is a fundamental skill. Elias right-clicked and selected 'Decode'

As he prepared to close the inspector, a red line of text caught his eye. It wasn't a standard HTML comment. It was inside a <script> tag that seemed to be running a silent observer function.