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diff --git a/js/public/SavedFrameAPI.h b/js/public/SavedFrameAPI.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/*
+ * Functions and types related to SavedFrame objects created by the Debugger
+ * API.
+ */
+
+#ifndef js_SavedFrameAPI_h
+#define js_SavedFrameAPI_h
+
+#include "jstypes.h"  // JS_FRIEND_API, JS_PUBLIC_API
+
+#include "js/RootingAPI.h"  // JS::Handle, JS::MutableHandle
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSObject;
+
+struct JSPrincipals;
+
+namespace JS {
+
+/*
+ * Accessors for working with SavedFrame JSObjects
+ *
+ * Each of these functions assert that if their `HandleObject savedFrame`
+ * argument is non-null, its JSClass is the SavedFrame class (or it is a
+ * cross-compartment or Xray wrapper around an object with the SavedFrame class)
+ * and the object is not the SavedFrame.prototype object.
+ *
+ * Each of these functions will find the first SavedFrame object in the chain
+ * whose underlying stack frame principals are subsumed by the given
+ * |principals|, and operate on that SavedFrame object. This prevents leaking
+ * information about privileged frames to un-privileged callers
+ *
+ * The SavedFrame in parameters do _NOT_ need to be in the same compartment as
+ * the cx, and the various out parameters are _NOT_ guaranteed to be in the same
+ * compartment as cx.
+ *
+ * You may consider or skip over self-hosted frames by passing
+ * `SavedFrameSelfHosted::Include` or `SavedFrameSelfHosted::Exclude`
+ * respectively.
+ *
+ * Additionally, it may be the case that there is no such SavedFrame object
+ * whose captured frame's principals are subsumed by |principals|! If the
+ * `HandleObject savedFrame` argument is null, or the |principals| do not
+ * subsume any of the chained SavedFrame object's principals,
+ * `SavedFrameResult::AccessDenied` is returned and a (hopefully) sane default
+ * value is chosen for the out param.
+ *
+ * See also `js/src/doc/SavedFrame/SavedFrame.md`.
+ */
+
+enum class SavedFrameResult { Ok, AccessDenied };
+
+enum class SavedFrameSelfHosted { Include, Exclude };
+
+/**
+ * Given a SavedFrame JSObject, get its source property. Defaults to the empty
+ * string.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameSource(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    MutableHandle<JSString*> sourcep,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get an ID identifying its ScriptSource.
+ * Defaults to 0.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameSourceId(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    uint32_t* sourceIdp,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get its line property. Defaults to 0.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameLine(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    uint32_t* linep,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get its column property. Defaults to 0.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameColumn(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    uint32_t* columnp,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get its functionDisplayName string, or nullptr
+ * if SpiderMonkey was unable to infer a name for the captured frame's
+ * function. Defaults to nullptr.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameFunctionDisplayName(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    MutableHandle<JSString*> namep,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get its asyncCause string. Defaults to nullptr.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameAsyncCause(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    MutableHandle<JSString*> asyncCausep,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get its asyncParent SavedFrame object or nullptr
+ * if there is no asyncParent. The `asyncParentp` out parameter is _NOT_
+ * guaranteed to be in the cx's compartment. Defaults to nullptr.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameAsyncParent(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    MutableHandle<JSObject*> asyncParentp,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame JSObject, get its parent SavedFrame object or nullptr if
+ * it is the oldest frame in the stack. The `parentp` out parameter is _NOT_
+ * guaranteed to be in the cx's compartment. Defaults to nullptr.
+ */
+extern JS_PUBLIC_API SavedFrameResult GetSavedFrameParent(
+    JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
+    MutableHandle<JSObject*> parentp,
+    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
+
+/**
+ * Given a SavedFrame object, convert it and its transitive parents to plain
+ * objects. Because SavedFrame objects store their properties on the prototype,
+ * they cannot be usefully stringified to JSON. Assigning their properties to
+ * plain objects allow those objects to be stringified and the saved frame stack
+ * can be encoded as a string.
+ */
+JS_PUBLIC_API JSObject* ConvertSavedFrameToPlainObject(
+    JSContext* cx, JS::HandleObject savedFrame,
+    JS::SavedFrameSelfHosted selfHosted);
+
+}  // namespace JS
+
+namespace js {
+
+/**
+ * Get the first SavedFrame object in this SavedFrame stack whose principals are
+ * subsumed by the given |principals|. If there is no such frame, return
+ * nullptr.
+ *
+ * Do NOT pass a non-SavedFrame object here.
+ */
+extern JS_FRIEND_API JSObject* GetFirstSubsumedSavedFrame(
+    JSContext* cx, JSPrincipals* principals, JS::Handle<JSObject*> savedFrame,
+    JS::SavedFrameSelfHosted selfHosted);
+
+}  // namespace js
+
+#endif /* js_SavedFrameAPI_h */