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    This article is in need of a technical review.

    The nsresult data type is a strongly-typed enum used to represent a value returned by an XPCOM function; these are typically error or status codes. For a list of defined result values, see Error codes returned by Mozilla APIs.

    Note: On compilers that do not support strongly-typed enums (that is, compilers that don't support this feature of C++11), it falls back to being an unsigned 32-bit integer, as in past versions of Gecko.

    Note: Prior to Gecko 19.0, nsresult was not strongly typed. As a result, it was possible for code to misuse it, such as returning an nsresult value from a function whose signature indicates it returns a boolean.

    Because nsresult is strongly typed, code like the following will result in an error at compile time:

    bool foo() {
      if (something) {
        return NS_ERROR_FAILURE;

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    Contributors to this page: Sheppy, ethertank, kscarfone
    Last updated by: Sheppy,