Gray out rows in a grid if a status column is inactive

admin-grid-status.js

// Drop this javascript in the page where your grid is - maybe using a .phtml
// in before_body_end or whatever.
var statuses = document.querySelectorAll(".admin-autoemail-adminhtml-rule-index td");
[].forEach.call(statuses, function (status) {
    if (status.textContent.indexOf("Inactive") > -1) {
        status.up('tr').style.color = "#aaa";
        status.up('tr').down('a').style.color = "#aaa";
    }
});