It will fund Firefox development :P
There's also Callahad commenting in this thread, who, as far as I'm aware, is a Mozilla employee. And well, he sort of confirmed that this is a move to diversify Mozilla's income streams:
>bearcobra 12 hours ago [-]
>Does this mark a strategy shift away from search revenue as the primary funding source? A quick crunchbase search for other aquicisions by Mozilla yeilded nothing, so I'm curious if there are other examples of them buying up for-profits.
>>callahad 12 hours ago [-]
>>Mozilla is actively working to diversify its sources of funding; the greatest step in that was when we switched from a global default of Google search to smaller, regional deals with Yahoo, Google, Yandex, and Baidu toward the end of 2014.