Firefox 13 also offers a better experience when you open a new tab, similar in many ways to how browser does it. Specifically, you'll see thumbnails of your most recently and frequently visited sites. The software also lets you customize the New Tab page by adding or removing thumbnails based on the pages you visit most.

5. More Speed

I wrote last month about Mozilla's "Project Snappy," and several key improvements from that effort combine to give Firefox 13 yet more speed. For example, when restoring a browsing session, Firefox first loads the tab you are currently viewing, then it loads background tabs on demand when you click them. "It's an improvement that makes Firefox start faster and use less memory," Mozilla explains.

Also resulting from Project Snappy are an improved mechanism for reducing Firefox's , a faster "first paint" when the browser is launched, and several other improvements.

6. It Speaks Your Language