First, champions of public domain rejoice! IMSLP (International Music Score Library Project) is back online! It was shut down last year when Universal Edition threatened to sue the site for copyright infridgement. Of course, if you don't know, IMSLP only contains scores that are in the public domain. That means free and legal. So most of the works you'll see there are PDF scans of very old sheet music. However, that doesn't sit well with companies that make good money off of long dead composers. So they used lawyers to intimidate the college student behind IMSLP, who does not have the means to legally protect himself. Thankfully, many people got behind the kid and offered support, including some prominent university legal experts. Regardless, it's back online!

Second, Firefox indeed set the Guiness World Record for Most Downloads in a 24-hour time frame. According to Spread Firefox: "We set a Guinness World Record for the most software downloads in 24 hours. With your help we reached 8,002,530 downloads."