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    Mozilla preferences for uber-geeks

    There are a lot of "secret" preferences in Mozilla that give you control over specific features or areas of the software that may not be safe for typical users to play with. This article provides a list of some of them.

    Warning: If you don't know for sure what you're doing, don't change these preferences! Doing so could cause any number of problems!

    Security preferences

    Preference name Possible values Notes
    browser.xul.error_pages.expert_bad_cert false (default)
    true
    By default, the "Add exception" button is not available on the error page that appears when an SSL certificate is invalid. If you set this preference to true, that button is restored. If you also set the browser.ssl_override_behavior preference to 2, the certificate information is prefetched into the error dialog, saving you another click to override the error.
    security.ssl.warn_missing_rfc5746

    1 (default)
    any integer

    Specifies whether or not the console log warning about SSL servers not supporting RFC 5746 should be displayed; by default, this value is 1, indicating that this warning should be displayed. If you don't want to get this warning, you can set this preference to 0. This is related to security warning CVE-2009-3555.

    Note: This preference is available in Gecko 1.9.1.11 (Firefox 3.5.11), Gecko 1.9.2.7 (Firefox 3.6.7), and Gecko 2.0 (Firefox 4).

    DOM preferences

    Preference name Possible values Notes
    dom.min_timeout_value Positive integers The minimum length of time, in milliseconds, that the window.setTimeout() function can set a timeout delay for. This defaults to 4 ms (before 10 ms). Calls to setTimeout() with a delay smaller than this will be clamped to this minimum value.
    dom.max_chrome_script_run_time Positive integers The maximum number of seconds that scripts running in chrome are allowed to run before being timed out.
    dom.send_after_paint_to_content false (default)
    true
    For security reasons, sending the MozAfterPaint event to web content is disabled by default for the time being; it is still sent to chrome, however. Setting this preference to true enables the event.

    Other preferences

    Preference name Possible values Notes
    prompts.tab_modal.enabled

    true (default)

    false

    If true, the new tab-modal alert style is used; if false, the old window-modal alerts are used instead.

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    Contributors to this page: lucasbetschart, Sheppy, Archaeopteryx
    Last updated by: Archaeopteryx,