Untitled

// ==UserScript==
// @name          View Add-on Compatibility Reports
// @namespace     http://userscripts.org/scripts/show/61398
// @version       0.1
// @description   Adds a link to add-on compatibility reports to addons.mozilla.org.
// @include       https://addons.mozilla.org/*
// @include       https://preview.addons.mozilla.org/*
// @author        http://userscripts.org/users/fcp
// @license       This program is in the public domain.
// ==/UserScript==

void function(){
  function encodeAsFormValue(s)
  {
    return s.replace(/[\x00-\x1F!\"#\$%&\'\(\)\*\+,\/\:;<=>\?@\[\\\]\^`\{\|\}]/g, function(str){
      var code = str.charCodeAt(0);
      if (code <= 0x0F)
        return '%0' + code.toString(16).toUpperCase();
      else
        return '%' + code.toString(16).toUpperCase();
    }).replace(/ /g, '+');
  }

  var found = location.href.match(/^https:\/\/[^\/]+\/([^\/?#]+)\/([^\/?#]+)\/addon\/.*\/?$/);
  if (!found)
    return;
  var lang = found[1];
  var application = found[2];
  let button = document.querySelector("#addon-summary .install-button a");
  if (!button) return;
  var addonid = button.href.match(/\d+/).toString();

  var parent = button.parentNode.parentNode.parentNode
  var div = parent.appendChild(document.createElement("div"));
  var a = div.appendChild(document.createElement('a'));
  a.href = '/' + lang + '/' + application + '/compatibility/reporter?guid=' + encodeAsFormValue(addonid);
  a.className = "button";
  a.appendChild(document.createTextNode('View compatibility reports'));
}();