An anonymous reader writes Mozilla has released its annual financial report for 2013, and the numbers hint as to why the organization signed a five-year deal with Yahoo, announced by the duo on November 19. Revenue increased just 1 percent, and the organization's reliance on Google stayed flat at 90 percent. The total revenue for the Mozilla Foundation and its subsidiaries in 2011 was $163 million, and it increased 90.2 percent to $311 million for 2012. Yet that growth all but disappeared last year, as the total revenue moved up less than 1 percent (0.995 percent to be more precise) to $311 million in 2013. 85 percent of Mozilla's revenue came from Google in 2011, and that figure increased to 90 percent in 2012. While the 90 percent number remained for 2013, it's still a massive proportion and shows Mozilla last year could not figure out a way to differentiate where its money comes from.