minimal patch for iOS firefox

www/common/boot2.js

@@ -37,6 +37,42 @@ define([
         window.alert("CryptPad needs localStorage to work. Try changing your cookie permissions, or using a different browser");
     };
 
+
+    var getLogElement = function () {
+        var logger = document.querySelector('#cp-logger');
+        if (logger) { return logger; }
+        logger = document.createElement('div');
+        logger.setAttribute('id', 'cp-logger');
+        document.body.appendChild(logger);
+        var css = function(){/* #cp-logger { display: none; } */}.toString().slice(14, -3);
+        var style = document.createElement('style');
+        style.type = 'text/css';
+        style.appendChild(document.createTextNode(css));
+        document.head.appendChild(style);
+        return logger;
+    };
+
+
+    var logToDom = function () {
+        var pre = document.createElement('pre');
+        pre.innerText = 'x';
+        getLogElement().appendChild(pre);
+    };
+
+    if (window.Proxy) {
+        var c = console;
+        window.console = new Proxy(c, {
+            get: function (o, k) {
+                if (k !== 'error') { return o[k]; }
+                return function () {
+                    var args = Array.prototype.slice.call(arguments);
+                    c.error.apply(null, args);
+                    logToDom();
+                };
+            },
+        });
+    }
+
     window.onerror = function (e) {
         if (/requirejs\.org/.test(e)) {
             console.log();