One of the more popular features of Firefox is it ability to extend its functionality through extensions (also called Add-on). These extensions allow the end-user to make many changes to their browsing experience, and gives programmers a operating system-independent platform to allow more people to use their software.
- Speed up browsing by blocking advertisements from being downloaded from websites
- Internet Relay Chat (IRC) client with features such as multi-server support, logging, DCC chat and file transfer
- Integrates your browser with del.icio.us, a social bookmarking service.
- Cross-Platform File Transfer Protocol (FTP) client built into browser.
- Replaces Flash objects in websites with placeholders to speed up browsing and block annoying advertisements
- Allows for pages to be displayed using Internet Explorer (Window only)
- Allows only trusted sites to run executable content on your computer.
- Allows user to save snippets of texts, links to sites, and notes, and to quickly manage them.
- A "collaborative surfing tool" that can help one discover hundreds of interesting sites.
- Adds a menu bar with many different helpful tools for web development.
- Helps collect, manage, and cite research sources.