Now you don’t have need to keep Facebook always open in a tab in Firefox to be notified of new updates. You can get latest updates and notifications including friends request, new messages etc. and also can chat with your Facebook friends right by clicking the icons in the upper-right corner of the Firefox without opening your Facebook account in a tab.
Facebook Messenger for Firefox keeps users connected to Facebook irrespective of the website they visit on the Firefox Web browser. The Facebook sidebar also appears to the right displaying the news ticker and also chat contacts. The sidebar can be hidden by clicking on the Facebook icon in the upper-right corner of Firefox and deselect Show Sidebar.
To get the Facebook Messenger for Firefox, all you need to download and install the latest version of Firefox and then visit the Facebook Messenger for Firefox page and click on the ‘Turn On.’ button.
To remove the Facebook Messenger for Firefox click on the Facebook icon in the upper-right corner of Firefox and then click on ‘Remove from Firefox’.