How to disable default browser check in Firefox

Mozilla Firefox displays the following message if it is not the default browser.


You can disable the above default browser message by either un ticking the check box with label as Always perform this check when starting Firefox. This can also be disabled using the Firefox Options. Click the Tools menu –> Options and navigate to Advanced tab and then to General sub tab


Under System Defaults section, un tick the checkbox with label as Always check to see if Firefox is the default browser on startup.

In Category: Browsers, Firefox

Ravi Shankar

A Software developer and blogger who is always looking to provide technical help to the wider community.

Show 3 Comments
  • lxguru December 4, 2010, 5:32 am

    For Firefox on Windows, there is a prefs.js file under c:\users\\AppData\Roaming\Mozilla\Firefox\Profiles\iwh1gbyt.default\, edit it to have following
    user_pref(“”, false);

    you won’t see the annoying dialog box comes up again.

  • Phil Gardocki December 24, 2015, 4:32 am

    Both of those things are unchecked for me but still every time I launch Firefox it asks. This has been since I updated to windows 10.

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