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diff --git a/devtools/client/webconsole/net/utils/json.js b/devtools/client/webconsole/net/utils/json.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+// List of JSON content types.
+const contentTypes = {
+ "text/plain": 1,
+ "text/javascript": 1,
+ "text/x-javascript": 1,
+ "text/json": 1,
+ "text/x-json": 1,
+ "application/json": 1,
+ "application/x-json": 1,
+ "application/javascript": 1,
+ "application/x-javascript": 1,
+ "application/json-rpc": 1
+};
+
+// Implementation
+var Json = {};
+
+/**
+ * Parsing JSON
+ */
+Json.parseJSONString = function (jsonString) {
+ if (!jsonString.length) {
+ return null;
+ }
+
+ let regex, matches;
+
+ let first = firstNonWs(jsonString);
+ if (first !== "[" && first !== "{") {
+ // This (probably) isn't pure JSON. Let's try to strip various sorts
+ // of XSSI protection/wrapping and see if that works better.
+
+ // Prototype-style secure requests
+ regex = /^\s*\/\*-secure-([\s\S]*)\*\/\s*$/;
+ matches = regex.exec(jsonString);
+ if (matches) {
+ jsonString = matches[1];
+
+ if (jsonString[0] === "\\" && jsonString[1] === "n") {
+ jsonString = jsonString.substr(2);
+ }
+
+ if (jsonString[jsonString.length - 2] === "\\" &&
+ jsonString[jsonString.length - 1] === "n") {
+ jsonString = jsonString.substr(0, jsonString.length - 2);
+ }
+ }
+
+ // Google-style (?) delimiters
+ if (jsonString.indexOf("&&&START&&&") !== -1) {
+ regex = /&&&START&&&([\s\S]*)&&&END&&&/;
+ matches = regex.exec(jsonString);
+ if (matches) {
+ jsonString = matches[1];
+ }
+ }
+
+ // while(1);, for(;;);, and )]}'
+ regex = /^\s*(\)\]\}[^\n]*\n|while\s*\(1\);|for\s*\(;;\);)([\s\S]*)/;
+ matches = regex.exec(jsonString);
+ if (matches) {
+ jsonString = matches[2];
+ }
+
+ // JSONP
+ regex = /^\s*([A-Za-z0-9_$.]+\s*(?:\[.*\]|))\s*\(([\s\S]*)\)/;
+ matches = regex.exec(jsonString);
+ if (matches) {
+ jsonString = matches[2];
+ }
+ }
+
+ try {
+ return JSON.parse(jsonString);
+ } catch (err) {
+ // eslint-disable-line no-empty
+ }
+
+ // Give up if we don't have valid start, to avoid some unnecessary overhead.
+ first = firstNonWs(jsonString);
+ if (first !== "[" && first !== "{" && isNaN(first) && first !== '"') {
+ return null;
+ }
+
+ // Remove JavaScript comments, quote non-quoted identifiers, and merge
+ // multi-line structures like |{"a": 1} \n {"b": 2}| into a single JSON
+ // object [{"a": 1}, {"b": 2}].
+ jsonString = pseudoJsonToJson(jsonString);
+
+ try {
+ return JSON.parse(jsonString);
+ } catch (err) {
+ // eslint-disable-line no-empty
+ }
+
+ return null;
+};
+
+function firstNonWs(str) {
+ for (let i = 0, len = str.length; i < len; i++) {
+ let ch = str[i];
+ if (ch !== " " && ch !== "\n" && ch !== "\t" && ch !== "\r") {
+ return ch;
+ }
+ }
+ return "";
+}
+
+function pseudoJsonToJson(json) {
+ let ret = "";
+ let at = 0, lasti = 0, lastch = "", hasMultipleParts = false;
+ for (let i = 0, len = json.length; i < len; ++i) {
+ let ch = json[i];
+ if (/\s/.test(ch)) {
+ continue;
+ }
+
+ if (ch === '"') {
+ // Consume a string.
+ ++i;
+ while (i < len) {
+ if (json[i] === "\\") {
+ ++i;
+ } else if (json[i] === '"') {
+ break;
+ }
+ ++i;
+ }
+ } else if (ch === "'") {
+ // Convert an invalid string into a valid one.
+ ret += json.slice(at, i) + "\"";
+ at = i + 1;
+ ++i;
+
+ while (i < len) {
+ if (json[i] === "\\") {
+ ++i;
+ } else if (json[i] === "'") {
+ break;
+ }
+ ++i;
+ }
+
+ if (i < len) {
+ ret += json.slice(at, i) + "\"";
+ at = i + 1;
+ }
+ } else if ((ch === "[" || ch === "{") &&
+ (lastch === "]" || lastch === "}")) {
+ // Multiple JSON messages in one... Make it into a single array by
+ // inserting a comma and setting the "multiple parts" flag.
+ ret += json.slice(at, i) + ",";
+ hasMultipleParts = true;
+ at = i;
+ } else if (lastch === "," && (ch === "]" || ch === "}")) {
+ // Trailing commas in arrays/objects.
+ ret += json.slice(at, lasti);
+ at = i;
+ } else if (lastch === "/" && lasti === i - 1) {
+ // Some kind of comment; remove it.
+ if (ch === "/") {
+ ret += json.slice(at, i - 1);
+ at = i + json.slice(i).search(/\n|\r|$/);
+ i = at - 1;
+ } else if (ch === "*") {
+ ret += json.slice(at, i - 1);
+ at = json.indexOf("*/", i + 1) + 2;
+ if (at === 1) {
+ at = len;
+ }
+ i = at - 1;
+ }
+ ch = "\0";
+ } else if (/[a-zA-Z$_]/.test(ch) && lastch !== ":") {
+ // Non-quoted identifier. Quote it.
+ ret += json.slice(at, i) + "\"";
+ at = i;
+ i = i + json.slice(i).search(/[^a-zA-Z0-9$_]|$/);
+ ret += json.slice(at, i) + "\"";
+ at = i;
+ }
+
+ lastch = ch;
+ lasti = i;
+ }
+
+ ret += json.slice(at);
+ if (hasMultipleParts) {
+ ret = "[" + ret + "]";
+ }
+
+ return ret;
+}
+
+Json.isJSON = function (contentType, data) {
+ // Workaround for JSON responses without proper content type
+ // Let's consider all responses starting with "{" as JSON. In the worst
+ // case there will be an exception when parsing. This means that no-JSON
+ // responses (and post data) (with "{") can be parsed unnecessarily,
+ // which represents a little overhead, but this happens only if the request
+ // is actually expanded by the user in the UI (Net & Console panels).
+ // Do a manual string search instead of checking (data.strip()[0] === "{")
+ // to improve performance/memory usage.
+ let len = data ? data.length : 0;
+ for (let i = 0; i < len; i++) {
+ let ch = data.charAt(i);
+ if (ch === "{") {
+ return true;
+ }
+
+ if (ch === " " || ch === "\t" || ch === "\n" || ch === "\r") {
+ continue;
+ }
+
+ break;
+ }
+
+ if (!contentType) {
+ return false;
+ }
+
+ contentType = contentType.split(";")[0];
+ contentType = contentType.trim();
+ return !!contentTypes[contentType];
+};
+
+// Exports from this module
+module.exports = Json;
+