chrome.commands.onCommand.addListener(cmd => {
    chrome.tabs.query({ currentWindow:true, active:true }, tabs => {
        const tab = tabs[0];
        if (!tab) return;
        switch (cmd) {
            case 'move-left': chrome.tabs.move(tab.id, { index:Math.max(0, tab.index-1) }); break;
            case 'move-right': chrome.tabs.move(tab.id, { index:tab.index+1 }); break;
            case 'move-to-first': chrome.tabs.move(tab.id, { index:0 }); break;
            case 'move-to-last': chrome.tabs.move(tab.id, { index:-1 }); break;
            case 'move-next-window': tabMoveWindow(tab, 1); break;
            case 'move-prev-window': tabMoveWindow(tab, -1); break;
        }
    });
});

function tabMoveWindow(tab, dir) {
    chrome.windows.getAll(wins => {
        if (wins.length <= 1)
            chrome.windows.create({ tabId:tab.id });
        else
            for (let i = 0; i < wins.length; i++)
                if (tab.windowId === wins[i].id)
                    return chrome.tabs.move(tab.id, { windowId: wins[(i + dir + wins.length) % wins.length].id, index:-1 }, newTab => {
                        chrome.tabs.highlight({ windowId:newTab.windowId, tabs:[newTab.index] }, () => {
                            chrome.windows.update(newTab.windowId, { focused:true });
                        });
                    });
    });
}