On Monday, Mozilla.org released version 13.0 of its Firefox web browser. The new version, a 30.7 megabyte download and adds the following fixes and changes:

When opening a new tab, users are now presented with their most visited pages.

- The default home page now has quicker access to bookmarks, history, settings, and more.

- SPDY protocol now enabled by default for faster browsing on supported sites.

- Restored background tabs are not loaded by default for faster startup.

- Smooth scrolling is now enabled by default.

- 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor.

- The column-fill CSS property has been implemented.

- Experimental support for ECMAScript 6 Map and Set objects has been implemented.

- Support for the CSS3 background-position property extended syntax has been added.

- The :invalid pseudo-class can now be applied to the element
.

- The CSS turn unit is now supported.

Firefox 13.0 requires an Intel-based Mac running Mac OS X 10.5 or later to install and run.

If you’ve tried the new version and have any feedback to offer, please let us know in the comments.