There are several ways where you can use a web browser to gather information about a target.
By default, on the Transport layer (OSI), the browser connects to:
- TCP port 80 (HTTP)
- TCP port 443 (HTTPS)
The web browser does not show these ports in the address bar.
Dev Tools
Developer Tools lets you inspect many things that your browser has received and exchanged with the remote server. For instance, you can view and even modify the JavaScript (JS) files, inspect the cookies set on your system and discover the folder structure of the site content.
Extensions
- foxy-proxy-basic
- User-Agent Switcher and Manager (Firefox) - alows to pretend to be accessing the webpage from a different OS or web browser
- Wappalyzer provides insights about the technologies used on the visited websites