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        processes.

    *   exec_pat => *re_from_str*

        Filter processes using regex against their exec.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   fname_pat => *re_from_str*

        Filter processes using regex against their fname.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   pid_pat => *re_from_str*

        Filter processes using regex against their pid.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   quiet => *true*

        (No description)

    *   users => *array[unix::uid::exists]*

        Kill browser processes that belong to certain user(s) only.

    Returns an enveloped result (an array).

    First element ($status_code) is an integer containing HTTP-like status
    code (200 means OK, 4xx caller error, 5xx function error). Second
    element ($reason) is a string containing error message, or something
    like "OK" if status is 200. Third element ($payload) is the actual
    result, but usually not present when enveloped result is an error
    response ($status_code is not 2xx). Fourth element (%result_meta) is
    called result metadata and is optional, a hash that contains extra
    information, much like how HTTP response headers provide additional
    metadata.

    Return value: (any)

  firefox_is_running
    Usage:

     firefox_is_running(%args) -> [$status_code, $reason, $payload, \%result_meta]

    Check whether Firefox is running.

    Firefox is defined as running if there are some Firefox processes that
    are *not* in 'stop' state. In other words, if Firefox has been started
    but is currently paused, we do not say that it's running. If you want to
    check if Firefox process exists, you can use "ps_firefox".

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   cmndline_pat => *re_from_str*

        Filter processes using regex against their cmndline.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   exec_pat => *re_from_str*

        Filter processes using regex against their exec.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   fname_pat => *re_from_str*

        Filter processes using regex against their fname.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   pid_pat => *re_from_str*

        Filter processes using regex against their pid.

        If one of the "*-pat" options are specified, then instead of the
        default heuristic rules to find the browser processes, these "*-pat"
        options are solely used to determine which processes are the browser
        processes.

    *   quiet => *true*

        (No description)

    *   users => *array[unix::uid::exists]*

        Kill browser processes that belong to certain user(s) only.

    Returns an enveloped result (an array).

    First element ($status_code) is an integer containing HTTP-like status
    code (200 means OK, 4xx caller error, 5xx function error). Second
    element ($reason) is a string containing error message, or something
    like "OK" if status is 200. Third element ($payload) is the actual
    result, but usually not present when enveloped result is an error
    response ($status_code is not 2xx). Fourth element (%result_meta) is
    called result metadata and is optional, a hash that contains extra
    information, much like how HTTP response headers provide additional