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Learn how to find out what Firefox version you are using, to help troubleshoot a problem or just to know if Firefox is up to date.

It's often important to know what version of Firefox you are using, to help you troubleshoot a problem or just to know if Firefox is up to date. Here are two ways to find out. *{for win,linux}Click the menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select {menu About Firefox}.{/for}{for mac}On the menu bar, click the {menu Firefox} menu and select {menu About Firefox}.{/for} The About Firefox window will appear. The version number is listed underneath the Firefox name. *;{for mac}[[Image:Firefox About window - v45 Mac]]{/for}{for win,linux}[[Image:Fx49-AboutFirefox]]{/for} {note}'''Note:''' Opening the About Firefox window will, by default, start an update check. If an updated version of Firefox is available, it will be automatically downloaded. For more information, see [[Update Firefox to the latest version]].{/note} *Alternatively, click the menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select {menu Troubleshooting Information}. A page with the address ''about:support'' will appear in a new tab. Your Firefox version is listed underneath the '''Application Basics''' section of the page. For more information, see [[Use the Troubleshooting Information page to help fix Firefox issues]].