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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 */
const { DevToolsLoader } = ChromeUtils.importESModule(
// `global: "devtools"` will import the loader in a special priviledged
// global created for DevTools, which will be reused as the shared global
// to load additional modules for the "DistinctSystemPrincipalLoader".
{ global: "devtools" }
// When debugging system principal resources (JSMs, chrome documents, ...)
// We have to load DevTools actors in another system principal global.
// That's mostly because of spidermonkey's Debugger API which requires
// debuggee and debugger to be in distinct principals.
// We try to hold a single instance of this special loader via this API.
// @param requester object
// Object/instance which is using the loader.
// The same requester object should be passed to release method.
let systemLoader = null;
const systemLoaderRequesters = new Set();
export function useDistinctSystemPrincipalLoader(requester) {
if (!systemLoader) {
systemLoader = new DevToolsLoader({
useDevToolsLoaderGlobal: true,
return systemLoader;
export function releaseDistinctSystemPrincipalLoader(requester) {
if (systemLoaderRequesters.size == 0) {
systemLoader = null;