Zooey Deschanel, Jonah Hill, Other Celebs Compete In Mozilla Firefox Charity Challenge

Mozilla Firefox has recruited 12 big-name celebs to compete in a one-month fundraising challenge and will grant the winner $25,000 to put toward a favorite cause.

Zooey Deschanel, Jonah Hill, Seth Rogan and Barbra Streisand are a few of the stars who signed on for the challenge that kicked off Dec. 14 and concludes on Jan. 11. Each is raising funds on the Crowdrise platform and is offering weekly prizes and giveaways to entice donors to get involved.

The philanthropic celebrities have chosen a range of causes to champion.

Deschanel is promoting the Innocence Project, a nonprofit that works to exonerate innocent people from death row. Hill is supporting Nothing But Nets, an organization that provides lifesaving mosquito nets to those in danger in Africa. Donors to his cause will be entered to win a t-shirt and Jonah Hill-recorded voicemail for their cell phones.

"We've brought together thousands of people to build a better web," the site reads. "Not for profit, but for good. This holiday season, help us take it one step further."