from Release Notes:
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Firefox is a fast, full-featured browser that makes browsing more
efficient than ever before. More information about Firefox is
available.
Firefox Preview Release (henceforth refered to as PR) is a Technology
Preview. While this software works well enough to be relied upon as
your primary browser in most cases, we make no guarantees of its
performance or stability. It is a pre-release product and should not
be relied upon for mission-critical tasks. See the License Agreement
for more information.
These release notes cover what's new, download and installation
instructions, known issues and frequently asked questions for the
Firefox PR release. Please read these notes and the bug filing
instructions before reporting any bugs to Bugzilla.
We want to hear your feedback about Firefox. Please join us in the
Firefox forums, hosted by MozillaZine.
What's New
Here's what's new in this release of Firefox:
* Live Bookmarks
You can now subscribe to and read RSS feeds in your
Bookmarks. When you visit a page that advertises a RSS feed by using a
<link> tag, a RSS icon will appear in the status bar. Click it to view
a list of feeds the page is offering. Click one to subscribe - this
adds a Bookmark Folder that contains all the recent posts from the
feed.
* Improved Find
Find is easier and more powerful now with our new Find
toolbar. The Find toolbar (which shows at the bottom of the browser
window) automatically highlights text in the page as you type and has
a useful highlight feature.
* Managing Annoyances and Protecting Security
You can now open blocked popups, and the Extension install
system now blocks all attempts to install software from sites other
than update.mozilla.org. Users can add other sites to a list that
allows them to offer software, but software is never automatically
installed. In addition to these steps, several other measures have
been taken to prevent phishing attacks and to highlight when a page is
being viewed over a secure connection.
* Better Bookmarks
Numerous improvements to bookmarks including more reliable
presentation of Site icons, and a split pane view in the Bookmarks
window.
* Strong Encryption For Passwords Available
Passwords saved with the Password Manager can now be more easily
encrypted with strong encryption by creating a "Master Password". If
you create a Master Password, you are prompted once per session to
enter the Master Password so that Password Manager can automatically
fill in site logins. A useful feature for people who share computers
with others and want improved security.
* Improved Compatibility for IE users
Undetectable document.all support for site compatibility and
improved compatibility for keyboard accelerators further smooth the
transition for IE users
* Better System Integration for GNOME users
You can now configure Firefox as your Default Browser on GNOME,
and Firefox will adhere to your GNOME settings for edit field key
bindings, etc.
* And a horde of other bug fixes...
See The Burning Edge's Bigger Picture for more details.
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Several security holes have been fixed. See the page bellow for
detail.
http://www.mozilla.org/projects/security/known-vulnerabilities.html#mozilla1.7.3
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