The new Facebook integration will mean that users will be able to keep up with friends and family without having to switch between or open new tabs. Users will be able to stay connected to integrated social media sites while they are Web searching, watching a video or playing a game, according to Mozilla.
To use the new preview version of the service, users can download or upgrade and install the new, free latest Firefox 17 and then visit the Facebook Messenger for Firefox page and click "Turn On."
Firefox browsers hold about 19.9 percent of the global browser market, compared with 54.1 percent for Microsoft's Internet Explorer browser, according to October figures from Web analysis firm Net Applications. Google's Chrome holds 18.5 percent, while Safari has about 5.2 percent.