At any time, you can check for updates.s
At the top of the Firefox window click the Firefox button, go over to the Help menu and select About Firefox. For Windows XP: Go to the Help menu and select About Firefox.On the menu bar click the Firefox menu and select About Firefox.At the top of the Firefox window click the Help menu and select About Firefox.
The About Firefox window will open and Firefox will begin checking for updates. If updates are available, they will begin downloading automatically. If Firefox is already up to date, just close the About Firefox window.
When the updates are downloaded and ready to be installed, click Apply Update. Firefox will be restarted and the updates will be installed.