Internet giant, Google has entered into a deal with Mozilla to keep Google as the default search engine for the Firefox browser.

Google will pay $300 million annually to the company for the integration of the search engine into the browser. The two companies have agreed to continue their partnership for another three years, adding to almost $1 billion payment by Google to the browser.

Mozilla chose Google over Microsoft and Yahoo, which wee also trying to tie with the company to offer their search engine as the default engine on its page. Meanwhile, Firefox browser has been struggling in the market amid intense competition from Google's own Chrome browser and others.

Firefox's market share has been falling and was recorded at 25.23 percent November, down from 26.39 percent in October, and from 31.17 percent in November of 2010, according to a report from StatCounter Global Stats.

The funding will be a major boost for the company, which earned about 84 percent of its revenues through Google. The total revenue for the open source firm stood at $123 million in the previous year.