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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. = About Firefox window = {for win,linux} # Click the menu button [[Image:New Fx Menu]] and click help [[Image:Help-29]] at the bottom of the menu that opens. # Select {menu About Firefox}. The About Firefox window will appear.{for win}<br/><br/>[[Image:fx-version-win10]] <br/>{/for} # Look under the Firefox name for the version number. {/for} {for mac} # On the menu bar, click the {menu Firefox} menu. # Select {menu About Firefox}. The About Firefox window will appear.<br/><br/>[[Image:Firefox About window - v45 Mac]]<br/> # Look under the Firefox name for the version number. {/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} = Troubleshooting Information page = # Click the menu button [[Image:New Fx Menu]] and click help [[Image:Help-29]] at the bottom of the menu that opens. # Select {menu Troubleshooting Information} from the list of help menu items. A page with the address ''about:support'' will appear in a new tab. # Look under '''Application Basics''' section of the page for your Firefox version number. For more information, see [[Use the Troubleshooting Information page to help fix Firefox issues]].