Firefox 18 also implements basic support for WebRTC, which will eventually allow compatible browsers to perform certain high-end functions such as video and voice calls without the need for third-party plugins.
Also Read → Chat and Check Notifications without Opening Facebook in Firefox
Apart from these features, there are some bug fixes and other smaller features. You can read full release notes from here Official Firefox 18 release note.
You can download Firefox 18 offline installer from the link below.
I downloaded ff 18. Should I and how do I uninstall ff 17?? I don’t remember the site from which I downloaded ff 18. How do I make certain that it is from Mozilla?
To install Firefox 18 you don’t need to uninstall the previous version, just run the setup.
Here I included Firefox download link which is from official site.