Firefox 15.0 Description:
Firefox 15.0 is a fast, full-featured Web browser.
Firefox 15.0 includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows you more of the page than any other browser and a number of additional features that work with you to help you get the most out of your time online.

The Web is all about innovation, and Firefox sets the pace with dozens of new features to deliver a faster, more secure and customizable Web browsing experience for all.

- Firefox 15.0 and "In Content Preferences":
In-content preferences are disabled by default, even in the latest Nightly versions, and interested users need to activate the new way of working with options in the browser first before they can do so. To enable the feature do the following:
- Enter about:config in the address bar and press the enter key. Verify that you will be careful if the warning message pops up
- Enter the parameter browser.preferences.inContent and hit the enter key again.
- Double-click the parameter to set it to true. This enables the feature, which is immediately available in the browser.

Firefox users who install add-ons may benefit from the memory optimization technologies that Mozilla added to Firefox 15.0. This basically does away with a certain type of memory leaking by add-ons so that you may notice a reduced memory usage, or at least no increase of memory usage during a session anymore.
Some Windows users may experience faster startup times of the web browser thanks to improvements in this area. Mozilla basically wants to disable prefetch for Firefox on the system to speed up the browser's start.
Basically, Firefox 15.0 users with lots of stuff going on should see performance improvements, while users on new or fast systems may not see much of a difference, if at all.
Firefox 15.0 may also see an implementation of the incremental garbage collection feature that reduce the time individual garbage collections which in turn reduces the wait time for the user.

Features:

- Comprehensive popup controls to keep unwanted advertising off your desktop;
- A tab browsing mode that lets you open several pages in a single window, allowing you to load links in the background without leaving the page you're on;
- Integrated search (powered by Google);
- Industry leading accessibility with Find As You Type - find links and page text by simply typing;
- Simplified privacy controls that let you cover your tracks more effectively;
- A streamlined browser window that lets you see more of the page than any other browser while at the same time being more configurable;
- A large variety of free downloadable extensions and themes that add specific functionality and visual changes to the browser.


News in Firefox 15.0:

The most important changes for users:
- Optimized memory usage for add-ons
- Preliminary native PDF support
- Support for SPDY networking protocol v3
- WebGL enhancements, including compressed textures for better performance

Developers new benefits and features:
- JavaScript debugger integrated into developer tools
- New layout view added to Inspector
- The CSS word-break property has been implemented.
- High precision event timer implemented
- New responsive design tool allows web developers to switch between desktop and mobile views of sites
- Native support for the Opus audio codec added
- The element now supports the media attribute
- The