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Code:

            var der = {};

            var p = new Promise(function (resolve, reject) {
                der.reject = reject;
            })
            p.then((v) => {
                console.log('resolve');
                console.log(v);
            })
            p.catch(function (v) {
                console.log(v);
                console.log('reject');
                console.log(v);
            });

            der.reject(p);
            console.log(p);

Only reject is output under Firefox, input normally under Chrome, and then Uncaught (in promise) will appear

Excuse me, why does an uncaught exception occur? The catch of p is clearly defined, and why does Firefox only output reject and the operation of outputting p has no effect (in fact, it should be caused by an uncaught exception)

Supplement:
The reason for the uncaught exception is that although the second function is not defined in then, then is still run, and the cause and status are passed to the returned new Promise object. The Promise object does not have a catch callback, so an exception is reported
But the reason why the output p in Firefox has no effect is still unclear