Firefox 5.0 version onwards new updated versions will be released frequently. Firefox prompts for new updates when ready , but suppose if you didn’t seen with your other work hurry or update settings was changed then Firefox updates will not install automatically. Firefox users who are not updated to latest version, need not to download again complete firefox. For this you need not to search for latest version download.
One Step to Update firefox latest version
If latest version is not available in your system, automatically firefox will be downloaded and updated in your system. Just you need to restart firefox after updation is completed.
Tips [How] to control Firefox updates
Goto Firefox(top left corner) -> options ->Advanced ->update.
Tick all the check boxes Firefox, Add-ons, Search Engines .
Tick the radio button Automatically download and install the update.
Some addons may not work in new updated versions of firefox to know which versions are not compatible, Select the Check box Warn me if this will disable any of my add-ons .
To know the latest installed version simply click on Show Update History command button.