Firefox Portable 21.0

Run Firefox from your removable/USB drive.

Portable Firefox is a fully functional package of Firefox optimized for use on a USB key drive. It has some specially-selected optimizations to make it perform faster and extend the life of your USB key as well as a specialized launcher that will allow most of your favorite extensions to work as you switch computers. It will also work from a CDRW drive (in packet mode), ZIP drives, external hard drives, some MP3 players, flash RAM cards and more.

What’s New:

• NEW Support for Retina Display on OS X 10.7 and up
• NEW Preliminary support for WebRTC
• CHANGED Experience better image quality with our new HTML scaling algorithm
• CHANGED Performance improvements around tab switching
• DEVELOPER CSS3 Flexbox implemented
• DEVELOPER Support for new DOM property window.devicePixelRatio
• DEVELOPER Support for @supports added
• DEVELOPER Improvement in startup time through smart handling of signed extension certificates
• HTML5 Support for W3C touch events impemented, taking the place of MozTouch events
• FIXED Disable insecure content loading on HTTPS pages (62178)
• FIXED Improved responsiveness for users on proxies (769764)

Known Issues

• UNRESOLVED If you try to start Firefox using a locked profile, it will crash (see 573369)
• UNRESOLVED For some users, scrolling in the main GMail window will be slower than usual (see 579260)
• UNRESOLVED Windows: The use of Microsoft's System Restore functionality shortly after updating Firefox may prevent future updates (see 730285)
• UNRESOLVED Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (see 802274)