Mozilla is offering users the option of downloading a version of Firefox that uses Microsoft Bing as the default search engine.
The company said it would offer the option in a post on the official Mozilla blog on Wednesday.
"Mozilla and Bing are pleased to make available Firefox with Bing, a customized version of Firefox that sets Bing as the default search engine in the search box and Awesome Bar and makes Bing.com the default home page," the company said.
The option also extends a partnership formed between Microsoft and Mozilla in October 2010 in which it said it would integrate Bing as a default option, alongside Google and Yahoo.
The decision also comes at a time when the organisation's contract with Google is approaching an end. It is due for renewal in November, having already been renewed previously in 2005, 2006, and 2008. Revenues from search providers, including Google, make up a majority of Mozilla's revenue.
Mozilla also said existing Firefox users can make the same changes by adding the Bing Search add-on for Firefox.