The document discusses several web browsers:
- Internet Explorer was developed by Microsoft and included in Windows starting in 1995, receiving criticism for security flaws and incompatibility with standards.
- Mozilla Firefox is open source and known for its security, performance, and customizability through extensions, but can be slower than other browsers.
- Google Chrome uses the WebKit engine and focuses on speed, security, and simplicity through minimal design.
- Opera is known for its speed, security, standards support through its Presto engine, and innovative features like tabs and site personalization.
- Safari is developed by Apple for Mac OS X and focuses on speed, design, safety, and supporting WebKit.