GM API says that GM_setValue can't save objects.

This is how to solve:
You need to extend functionality of the GM_setValue and GM_getValue
like this:

        // extend GM_setValue to be able to save Object
        (function() {
                var oldFunc = GM_setValue;

                GM_setValue = function(name, value) {
                        var wrapper = {
                                value: value,
                        };
                        oldFunc(name, uneval(wrapper));
                };
        })();

        // extend GM_getValue to be able to load Object
        (function() {
                var oldFunc = GM_getValue;

                GM_getValue = function(name, def) {
                        var wrapped = eval(oldFunc(name));
                        if (wrapped == undefined) {
                                return def;
                        }
                        return wrapped.value;
                };
        })();

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