Session restore is activated automatically when installing an application update or extension, and users will be asked if they want to resume their previous session after a system crash.

Inline spell checking is now built into Firefox which helps Web surfers check the spelling of text entered into Web forms without the need for a separate application.

While exact numbers are difficult to determine, Firefox now may have as many as 80 million users and over 10 percent of the browser market.

Other feature enhancements in version 2.0 include interactive search capabilities, more flexible handling of RSS Web feeds, "Live Title" bookmarks with a summary of the Web site, support for JavaScript 1.7 and SVG text, and new support for storing structured data on the client side, to enable better handling of online transactions and improved performance when dealing with large amounts of data, such as documents and mailboxes.

For security, Firefox now includes built-in phishing protection which warns users when they encounter suspected Web forgeries, and offers to return the user to their home page.