loadJSON("extensions/index.json");
function loadJSON(file){
  fetch(file)
  .then(function (response) {
    return response.json();
  })
  .then(function (data) {
    appendData(data);
  })
  .catch(function (err) {
    console.log('error: ' + err);
  });
}
function appendData(data) {
  for (var i = 0; i < data.length; i++) {
    var mainContainer = document.getElementById(data[i].extension + "sData");
    var tr = document.createElement("tr");
    tr.innerHTML = 
      "<td id='name'>" + data[i].name + "</td>" +
      "<td id='url'><a href=" + data[i].url + ">" + data[i].url.substr(15) + "</a></td>"
    mainContainer.appendChild(tr);
  }
}