gistfile1.txt

    function messageIdToRoomId (mid) {
        return fetch(`http://crossorigin.me/http://chat.stackoverflow.com/messages/${mid}/history`).then(function (res) {
            return res.text();
        }).then(function (html) {
            return new DOMParser().parseFromString(html, 'text/html');
        }).then(function (doc) {
            return doc.querySelector(`a[name="${mid}"]`).getAttribute('href').match(/\d+/)[0];
        });
    }
    
    var data = [25159129,25169597,25169597,25146812]; // add more ids to this I guess :/
    
    
    window.store = [];
    var i = 0;
    function doAll () {
        messageIdToRoomId(data[i]).then(function (rid) {
            store.push({mid: data[i], rid: rid});
            i++;
            data[i] ? doAll() : console.log('done. execute copy(JSON.stringify(window.store, null, " ")) now');
        });
    }
    
    doAll();