gistfile1.js

//let inactiveTextboxes = ["keysnail-prompt-textbox", "urlbar", ...];
let inactiveTextboxes = ["keysnail-prompt-textbox"];
let doc = document;
if (doc.getElementById("content")) {
    for each (let id in inactiveTextboxes) {
      let box = doc.getElementById(id);
      let input = doc.getAnonymousElementByAttribute(box, 'anonid', 'input');
      if (input)
          input.style.imeMode = "inactive";
    }
}