Mozilla is set to release Firefox 19 for desktop tomorrow, Tuesday February 19th, but it appears that the download is already live! If you want to grab Firefox 19 a day early, grab your download here!
Firefox 19 is set to bring a built-in PDF viewer as well as various bug fixes and improvements, such as application start-up improvement. If you prefer to wait until tomorrow to grab the download once it is officially announced, simply keep your browser pointed to Firefox.com. You can check out the full change log here or hit the download link to grab Firefox 19 now!