Hmm, that's odd, maybe it's a customized version of Firefox.

Can you try using the "About Firefox" dialog on the Help menu, or the "?" button on the "3-bar" application menu. Does that trigger an update check?

That happens if you have a Firefox version from the repositories of your Linux distribution. You need to update Firefox via your Linux software management.

You can alternatively install the version from the Mozilla servers. You can find the full version of the current Firefox 36.0 release in all languages and for all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/
• http://kb.mozillazine.org/Installing_Firefox#Linux

I got a solution for this and it worked like a charm. Thanks for trying though. Cheers! Stackoverflow