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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 {for not fx57}[[Image:New Fx Menu]]{/for}{for fx57}[[Image:Fx57Menu]]{/for}, click {for not fx57}help [[Image:Help-29]]{/for}{for fx57}{menu Help}{/for} 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.<br>''Here is an example of what the About Firefox window will look like:'' *;{for mac}[[Image:Fx56AboutFirefox-macOS]]{/for}{for win}[[Image:about firefox58.0.2]] {/for}{for linux}[[Image:About Firefox Quantum - Linux]]{/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 linux}On Linux, this will happen only if you use a build downloaded from Mozilla's website; otherwise, updates will come through your Package Manager. {/for} For more information, see [[Update Firefox to the latest version]].{/note} *Alternatively, click the menu button {for not fx57}[[Image:New Fx Menu]]{/for}{for fx57}[[Image:Fx57Menu]]{/for}, click {for not fx57}help [[Image:Help-29]]{/for}{for fx57}{menu Help}{/for} 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]].