Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

68 files changed, 5394 insertions, 0 deletions

diff --git a/devtools/shared/specs/accessibility.js b/devtools/shared/specs/accessibility.js
new file mode 100644
index 0000000000..acfd7db068
--- /dev/null
+++ b/devtools/shared/specs/accessibility.js
@@ -0,0 +1,299 @@
+/* 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";
+
+const protocol = require("resource://devtools/shared/protocol.js");
+const { Arg, generateActorSpec, RetVal, types } = protocol;
+
+types.addActorType("accessible");
+
+/**
+ * Accessible with children listed in the ancestry structure calculated by the
+ * walker.
+ */
+types.addDictType("accessibleWithChildren", {
+  // Accessible
+  accessible: "accessible",
+  // Accessible's children
+  children: "array:accessible",
+});
+
+/**
+ * Data passed via "audit-event" to the client. It may include type, a list of
+ * ancestries for accessible actors that have failing accessibility checks or
+ * a progress information.
+ */
+types.addDictType("auditEventData", {
+  type: "string",
+  // List of ancestries (array:accessibleWithChildren)
+  ancestries: "nullable:array:array:accessibleWithChildren",
+  // Audit progress information
+  progress: "nullable:json",
+});
+
+/**
+ * Accessible relation object described by its type that also includes relation targets.
+ */
+types.addDictType("accessibleRelation", {
+  // Accessible relation type
+  type: "string",
+  // Accessible relation's targets
+  targets: "array:accessible",
+});
+
+const accessibleSpec = generateActorSpec({
+  typeName: "accessible",
+
+  events: {
+    "actions-change": {
+      type: "actionsChange",
+      actions: Arg(0, "array:string"),
+    },
+    "name-change": {
+      type: "nameChange",
+      name: Arg(0, "string"),
+      parent: Arg(1, "nullable:accessible"),
+    },
+    "value-change": {
+      type: "valueChange",
+      value: Arg(0, "string"),
+    },
+    "description-change": {
+      type: "descriptionChange",
+      description: Arg(0, "string"),
+    },
+    "states-change": {
+      type: "statesChange",
+      states: Arg(0, "array:string"),
+    },
+    "attributes-change": {
+      type: "attributesChange",
+      attributes: Arg(0, "json"),
+    },
+    "shortcut-change": {
+      type: "shortcutChange",
+      shortcut: Arg(0, "string"),
+    },
+    reorder: {
+      type: "reorder",
+      childCount: Arg(0, "number"),
+    },
+    "text-change": {
+      type: "textChange",
+    },
+    "index-in-parent-change": {
+      type: "indexInParentChange",
+      indexInParent: Arg(0, "number"),
+    },
+    audited: {
+      type: "audited",
+      audit: Arg(0, "nullable:json"),
+    },
+  },
+
+  methods: {
+    audit: {
+      request: { options: Arg(0, "nullable:json") },
+      response: {
+        audit: RetVal("nullable:json"),
+      },
+    },
+    children: {
+      request: {},
+      response: {
+        children: RetVal("array:accessible"),
+      },
+    },
+    getRelations: {
+      request: {},
+      response: {
+        relations: RetVal("array:accessibleRelation"),
+      },
+    },
+    hydrate: {
+      request: {},
+      response: {
+        properties: RetVal("json"),
+      },
+    },
+    snapshot: {
+      request: {},
+      response: {
+        snapshot: RetVal("json"),
+      },
+    },
+  },
+});
+
+const accessibleWalkerSpec = generateActorSpec({
+  typeName: "accessiblewalker",
+
+  events: {
+    "document-ready": {
+      type: "documentReady",
+    },
+    "picker-accessible-picked": {
+      type: "pickerAccessiblePicked",
+      accessible: Arg(0, "nullable:accessible"),
+    },
+    "picker-accessible-previewed": {
+      type: "pickerAccessiblePreviewed",
+      accessible: Arg(0, "nullable:accessible"),
+    },
+    "picker-accessible-hovered": {
+      type: "pickerAccessibleHovered",
+      accessible: Arg(0, "nullable:accessible"),
+    },
+    "picker-accessible-canceled": {
+      type: "pickerAccessibleCanceled",
+    },
+    "highlighter-event": {
+      type: "highlighter-event",
+      data: Arg(0, "json"),
+    },
+    "audit-event": {
+      type: "audit-event",
+      audit: Arg(0, "auditEventData"),
+    },
+  },
+
+  methods: {
+    children: {
+      request: {},
+      response: {
+        children: RetVal("array:accessible"),
+      },
+    },
+    getAccessibleFor: {
+      request: { node: Arg(0, "domnode") },
+      response: {
+        accessible: RetVal("nullable:accessible"),
+      },
+    },
+    getAncestry: {
+      request: { accessible: Arg(0, "accessible") },
+      response: {
+        ancestry: RetVal("array:accessibleWithChildren"),
+      },
+    },
+    startAudit: {
+      request: { options: Arg(0, "nullable:json") },
+    },
+    highlightAccessible: {
+      request: {
+        accessible: Arg(0, "accessible"),
+        options: Arg(1, "nullable:json"),
+      },
+      response: {
+        value: RetVal("nullable:boolean"),
+      },
+    },
+    unhighlight: {
+      request: {},
+    },
+    pick: {},
+    pickAndFocus: {},
+    cancelPick: {},
+    showTabbingOrder: {
+      request: {
+        elm: Arg(0, "domnode"),
+        index: Arg(1, "number"),
+      },
+      response: {
+        tabbingOrderInfo: RetVal("json"),
+      },
+    },
+    hideTabbingOrder() {},
+  },
+});
+
+const simulatorSpec = generateActorSpec({
+  typeName: "simulator",
+
+  methods: {
+    simulate: {
+      request: { options: Arg(0, "nullable:json") },
+      response: {
+        value: RetVal("boolean"),
+      },
+    },
+  },
+});
+
+const accessibilitySpec = generateActorSpec({
+  typeName: "accessibility",
+
+  events: {
+    init: {
+      type: "init",
+    },
+    shutdown: {
+      type: "shutdown",
+    },
+  },
+
+  methods: {
+    getTraits: {
+      request: {},
+      response: { traits: RetVal("json") },
+    },
+    bootstrap: {
+      request: {},
+      response: {
+        state: RetVal("json"),
+      },
+    },
+    getWalker: {
+      request: {},
+      response: {
+        walker: RetVal("accessiblewalker"),
+      },
+    },
+    getSimulator: {
+      request: {},
+      response: {
+        simulator: RetVal("nullable:simulator"),
+      },
+    },
+  },
+});
+
+const parentAccessibilitySpec = generateActorSpec({
+  typeName: "parentaccessibility",
+
+  events: {
+    "can-be-disabled-change": {
+      type: "canBeDisabledChange",
+      canBeDisabled: Arg(0, "boolean"),
+    },
+    "can-be-enabled-change": {
+      type: "canBeEnabledChange",
+      canBeEnabled: Arg(0, "boolean"),
+    },
+  },
+
+  methods: {
+    bootstrap: {
+      request: {},
+      response: {
+        state: RetVal("json"),
+      },
+    },
+    enable: {
+      request: {},
+      response: {},
+    },
+    disable: {
+      request: {},
+      response: {},
+    },
+  },
+});
+
+exports.accessibleSpec = accessibleSpec;
+exports.accessibleWalkerSpec = accessibleWalkerSpec;
+exports.accessibilitySpec = accessibilitySpec;
+exports.parentAccessibilitySpec = parentAccessibilitySpec;
+exports.simulatorSpec = simulatorSpec;
diff --git a/devtools/shared/specs/addon/addons.js b/devtools/shared/specs/addon/addons.js
new file mode 100644
index 0000000000..309a7acdf5
--- /dev/null
+++ b/devtools/shared/specs/addon/addons.js
@@ -0,0 +1,33 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const addonsSpec = generateActorSpec({
+  typeName: "addons",
+
+  methods: {
+    installTemporaryAddon: {
+      request: {
+        addonPath: Arg(0, "string"),
+        openDevTools: Arg(1, "nullable:boolean"),
+      },
+      response: { addon: RetVal("json") },
+    },
+
+    uninstallAddon: {
+      request: {
+        addonId: Arg(0, "string"),
+      },
+      response: {},
+    },
+  },
+});
+
+exports.addonsSpec = addonsSpec;
diff --git a/devtools/shared/specs/addon/moz.build b/devtools/shared/specs/addon/moz.build
new file mode 100644
index 0000000000..e382173641
--- /dev/null
+++ b/devtools/shared/specs/addon/moz.build
@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+DevToolsModules(
+    "addons.js",
+    "webextension-inspected-window.js",
+)
diff --git a/devtools/shared/specs/addon/webextension-inspected-window.js b/devtools/shared/specs/addon/webextension-inspected-window.js
new file mode 100644
index 0000000000..3a0cf166ed
--- /dev/null
+++ b/devtools/shared/specs/addon/webextension-inspected-window.js
@@ -0,0 +1,119 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+/**
+ * Sent with the eval and reload requests, used to inform the
+ * webExtensionInspectedWindowActor about the caller information
+ * to be able to evaluate code as being executed from the caller
+ * WebExtension sources, or log errors with information that can
+ * help the addon developer to more easily identify the affected
+ * lines in his own addon code.
+ */
+types.addDictType("webExtensionCallerInfo", {
+  // Information related to the line of code that has originated
+  // the request.
+  url: "string",
+  lineNumber: "nullable:number",
+
+  // The called addonId.
+  addonId: "string",
+});
+
+/**
+ * RDP type related to the inspectedWindow.eval method request.
+ */
+types.addDictType("webExtensionEvalOptions", {
+  frameURL: "nullable:string",
+  contextSecurityOrigin: "nullable:string",
+  useContentScriptContext: "nullable:boolean",
+
+  // Return the evalResult as a grip (used by the WebExtensions
+  // devtools inspector's sidebar.setExpression API method).
+  evalResultAsGrip: "nullable:boolean",
+
+  // The actor ID of the node selected in the inspector if any,
+  // used to provide the '$0' binding.
+  toolboxSelectedNodeActorID: "nullable:string",
+
+  // The actor ID of the console actor,
+  // used to provide the 'inspect' binding.
+  toolboxConsoleActorID: "nullable:string",
+});
+
+/**
+ * RDP type related to the inspectedWindow.eval method result errors.
+ *
+ * This type has been modelled on the same data format
+ * used in the corresponding chrome API method.
+ */
+types.addDictType("webExtensionEvalExceptionInfo", {
+  // The following properties are set if the error has not occurred
+  // in the evaluated JS code.
+  isError: "nullable:boolean",
+  code: "nullable:string",
+  description: "nullable:string",
+  details: "nullable:array:json",
+
+  // The following properties are set if the error has occurred
+  // in the evaluated JS code.
+  isException: "nullable:string",
+  value: "nullable:string",
+});
+
+/**
+ * RDP type related to the inspectedWindow.eval method result.
+ */
+types.addDictType("webExtensionEvalResult", {
+  // The following properties are set if the evaluation has been
+  // completed successfully.
+  value: "nullable:json",
+  valueGrip: "nullable:json",
+  // The following properties are set if the evalutation has been
+  // completed with errors.
+  exceptionInfo: "nullable:webExtensionEvalExceptionInfo",
+});
+
+/**
+ * RDP type related to the inspectedWindow.reload method request.
+ */
+types.addDictType("webExtensionReloadOptions", {
+  ignoreCache: "nullable:boolean",
+  userAgent: "nullable:string",
+  injectedScript: "nullable:string",
+});
+
+const webExtensionInspectedWindowSpec = generateActorSpec({
+  typeName: "webExtensionInspectedWindow",
+
+  methods: {
+    reload: {
+      request: {
+        webExtensionCallerInfo: Arg(0, "webExtensionCallerInfo"),
+        options: Arg(1, "webExtensionReloadOptions"),
+      },
+    },
+    eval: {
+      request: {
+        webExtensionCallerInfo: Arg(0, "webExtensionCallerInfo"),
+        expression: Arg(1, "string"),
+        options: Arg(2, "webExtensionEvalOptions"),
+      },
+
+      response: {
+        evalResult: RetVal("webExtensionEvalResult"),
+      },
+    },
+  },
+});
+
+exports.webExtensionInspectedWindowSpec = webExtensionInspectedWindowSpec;
diff --git a/devtools/shared/specs/animation.js b/devtools/shared/specs/animation.js
new file mode 100644
index 0000000000..95acd606b5
--- /dev/null
+++ b/devtools/shared/specs/animation.js
@@ -0,0 +1,110 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+/**
+ * Sent with the 'mutations' event as part of an array of changes, used to
+ * inform fronts of the type of change that occured.
+ */
+types.addDictType("animationMutationChange", {
+  // The type of change ("added" or "removed").
+  type: "string",
+  // The changed AnimationPlayerActor.
+  player: "animationplayer",
+});
+
+const animationPlayerSpec = generateActorSpec({
+  typeName: "animationplayer",
+
+  events: {
+    changed: {
+      type: "changed",
+      state: Arg(0, "json"),
+    },
+  },
+
+  methods: {
+    release: { release: true },
+    getCurrentState: {
+      request: {},
+      response: {
+        data: RetVal("json"),
+      },
+    },
+    getAnimationTypes: {
+      request: {
+        propertyNames: Arg(0, "array:string"),
+      },
+      response: {
+        animationTypes: RetVal("json"),
+      },
+    },
+  },
+});
+
+exports.animationPlayerSpec = animationPlayerSpec;
+
+const animationsSpec = generateActorSpec({
+  typeName: "animations",
+
+  events: {
+    mutations: {
+      type: "mutations",
+      changes: Arg(0, "array:animationMutationChange"),
+    },
+  },
+
+  methods: {
+    setWalkerActor: {
+      request: {
+        walker: Arg(0, "domwalker"),
+      },
+      response: {},
+    },
+    getAnimationPlayersForNode: {
+      request: {
+        actorID: Arg(0, "domnode"),
+      },
+      response: {
+        players: RetVal("array:animationplayer"),
+      },
+    },
+    pauseSome: {
+      request: {
+        players: Arg(0, "array:animationplayer"),
+      },
+      response: {},
+    },
+    playSome: {
+      request: {
+        players: Arg(0, "array:animationplayer"),
+      },
+      response: {},
+    },
+    setCurrentTimes: {
+      request: {
+        players: Arg(0, "array:animationplayer"),
+        time: Arg(1, "number"),
+        shouldPause: Arg(2, "boolean"),
+      },
+      response: {},
+    },
+    setPlaybackRates: {
+      request: {
+        players: Arg(0, "array:animationplayer"),
+        rate: Arg(1, "number"),
+      },
+      response: {},
+    },
+  },
+});
+
+exports.animationsSpec = animationsSpec;
diff --git a/devtools/shared/specs/array-buffer.js b/devtools/shared/specs/array-buffer.js
new file mode 100644
index 0000000000..ba7650ff61
--- /dev/null
+++ b/devtools/shared/specs/array-buffer.js
@@ -0,0 +1,24 @@
+/* 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";
+
+const protocol = require("resource://devtools/shared/protocol.js");
+const { Arg, RetVal, generateActorSpec } = protocol;
+
+const arrayBufferSpec = generateActorSpec({
+  typeName: "arraybuffer",
+
+  methods: {
+    slice: {
+      request: {
+        start: Arg(0),
+        count: Arg(1),
+      },
+      response: RetVal("json"),
+    },
+    release: { release: true },
+  },
+});
+
+exports.arrayBufferSpec = arrayBufferSpec;
diff --git a/devtools/shared/specs/blackboxing.js b/devtools/shared/specs/blackboxing.js
new file mode 100644
index 0000000000..baf773f77f
--- /dev/null
+++ b/devtools/shared/specs/blackboxing.js
@@ -0,0 +1,42 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("blackboxing.position", {
+  line: "number",
+  column: "number",
+});
+
+types.addDictType("blackboxing.range", {
+  start: "blackboxing.position",
+  end: "blackboxing.position",
+});
+
+const blackboxingSpec = generateActorSpec({
+  typeName: "blackboxing",
+
+  methods: {
+    blackbox: {
+      request: {
+        url: Arg(0, "string"),
+        range: Arg(1, "array:blackboxing.range"),
+      },
+    },
+    unblackbox: {
+      request: {
+        url: Arg(0, "string"),
+        range: Arg(1, "array:blackboxing.range"),
+      },
+    },
+  },
+});
+
+exports.blackboxingSpec = blackboxingSpec;
diff --git a/devtools/shared/specs/breakpoint-list.js b/devtools/shared/specs/breakpoint-list.js
new file mode 100644
index 0000000000..3e4e0eff00
--- /dev/null
+++ b/devtools/shared/specs/breakpoint-list.js
@@ -0,0 +1,54 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("breakpoint-list.breakpoint-options", {
+  condition: "nullable:string",
+  logValue: "nullable:string",
+});
+
+const breakpointListSpec = generateActorSpec({
+  typeName: "breakpoint-list",
+
+  methods: {
+    setBreakpoint: {
+      request: {
+        location: Arg(0, "json"),
+        options: Arg(1, "breakpoint-list.breakpoint-options"),
+      },
+    },
+    removeBreakpoint: {
+      request: {
+        location: Arg(0, "json"),
+      },
+    },
+
+    setXHRBreakpoint: {
+      request: {
+        path: Arg(0, "string"),
+        method: Arg(1, "string"),
+      },
+    },
+    removeXHRBreakpoint: {
+      request: {
+        path: Arg(0, "string"),
+        method: Arg(1, "string"),
+      },
+    },
+    setActiveEventBreakpoints: {
+      request: {
+        ids: Arg(0, "array:string"),
+      },
+    },
+  },
+});
+
+exports.breakpointListSpec = breakpointListSpec;
diff --git a/devtools/shared/specs/changes.js b/devtools/shared/specs/changes.js
new file mode 100644
index 0000000000..ba8f2fd042
--- /dev/null
+++ b/devtools/shared/specs/changes.js
@@ -0,0 +1,40 @@
+/* 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";
+
+const {
+  Arg,
+  generateActorSpec,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const changesSpec = generateActorSpec({
+  typeName: "changes",
+
+  events: {
+    "add-change": {
+      type: "addChange",
+      change: Arg(0, "json"),
+    },
+    "remove-change": {
+      type: "removeChange",
+      change: Arg(0, "json"),
+    },
+    "clear-changes": {
+      type: "clearChanges",
+    },
+  },
+
+  methods: {
+    allChanges: {
+      response: {
+        changes: RetVal("array:json"),
+      },
+    },
+    start: {}, // no arguments, no response
+  },
+});
+
+exports.changesSpec = changesSpec;
diff --git a/devtools/shared/specs/compatibility.js b/devtools/shared/specs/compatibility.js
new file mode 100644
index 0000000000..0af211860a
--- /dev/null
+++ b/devtools/shared/specs/compatibility.js
@@ -0,0 +1,69 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("browsertype", {
+  id: "string",
+  name: "string",
+  version: "string",
+  status: "string",
+});
+
+types.addDictType("compatibilityissues", {
+  type: "string",
+  property: "string",
+  aliases: "nullable:array:string",
+  url: "nullable:string",
+  specUrl: "nullable:string",
+  deprecated: "boolean",
+  experimental: "boolean",
+  unsupportedBrowsers: "array:browsertype",
+});
+
+types.addDictType("declaration", {
+  name: "string",
+  value: "string",
+});
+
+const compatibilitySpec = generateActorSpec({
+  typeName: "compatibility",
+
+  methods: {
+    // While not being used on the client at the moment, keep this method in case
+    // we need traits again to support backwards compatibility for the Compatibility
+    // actor.
+    getTraits: {
+      request: {},
+      response: { traits: RetVal("json") },
+    },
+    getCSSDeclarationBlockIssues: {
+      request: {
+        domRulesDeclarations: Arg(0, "array:array:declaration"),
+        targetBrowsers: Arg(1, "array:browsertype"),
+      },
+      response: {
+        compatibilityIssues: RetVal("array:array:compatibilityissues"),
+      },
+    },
+    getNodeCssIssues: {
+      request: {
+        node: Arg(0, "domnode"),
+        targetBrowsers: Arg(1, "array:browsertype"),
+      },
+      response: {
+        compatibilityIssues: RetVal("array:compatibilityissues"),
+      },
+    },
+  },
+});
+
+exports.compatibilitySpec = compatibilitySpec;
diff --git a/devtools/shared/specs/css-properties.js b/devtools/shared/specs/css-properties.js
new file mode 100644
index 0000000000..04aadd22c6
--- /dev/null
+++ b/devtools/shared/specs/css-properties.js
@@ -0,0 +1,23 @@
+/* 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";
+
+const {
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const cssPropertiesSpec = generateActorSpec({
+  typeName: "cssProperties",
+
+  methods: {
+    getCSSDatabase: {
+      request: {},
+
+      response: RetVal("json"),
+    },
+  },
+});
+
+exports.cssPropertiesSpec = cssPropertiesSpec;
diff --git a/devtools/shared/specs/descriptors/moz.build b/devtools/shared/specs/descriptors/moz.build
new file mode 100644
index 0000000000..bf297b3dcb
--- /dev/null
+++ b/devtools/shared/specs/descriptors/moz.build
@@ -0,0 +1,12 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+DevToolsModules(
+    "process.js",
+    "tab.js",
+    "webextension.js",
+    "worker.js",
+)
diff --git a/devtools/shared/specs/descriptors/process.js b/devtools/shared/specs/descriptors/process.js
new file mode 100644
index 0000000000..f9cb1d4ce6
--- /dev/null
+++ b/devtools/shared/specs/descriptors/process.js
@@ -0,0 +1,41 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  RetVal,
+  Option,
+} = require("resource://devtools/shared/protocol.js");
+
+const processDescriptorSpec = generateActorSpec({
+  typeName: "processDescriptor",
+
+  methods: {
+    getTarget: {
+      request: {},
+      response: {
+        process: RetVal("json"),
+      },
+    },
+    getWatcher: {
+      request: {},
+      response: RetVal("watcher"),
+    },
+    reloadDescriptor: {
+      request: {
+        bypassCache: Option(0, "boolean"),
+      },
+      response: {},
+    },
+  },
+
+  events: {
+    "descriptor-destroyed": {
+      type: "descriptor-destroyed",
+    },
+  },
+});
+
+exports.processDescriptorSpec = processDescriptorSpec;
diff --git a/devtools/shared/specs/descriptors/tab.js b/devtools/shared/specs/descriptors/tab.js
new file mode 100644
index 0000000000..c2c0f69431
--- /dev/null
+++ b/devtools/shared/specs/descriptors/tab.js
@@ -0,0 +1,50 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Option,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const tabDescriptorSpec = generateActorSpec({
+  typeName: "tabDescriptor",
+
+  methods: {
+    getTarget: {
+      request: {},
+      response: {
+        frame: RetVal("json"),
+      },
+    },
+    getFavicon: {
+      request: {},
+      response: {
+        favicon: RetVal("string"),
+      },
+    },
+    getWatcher: {
+      request: {
+        isServerTargetSwitchingEnabled: Option(0, "boolean"),
+        isPopupDebuggingEnabled: Option(0, "boolean"),
+      },
+      response: RetVal("watcher"),
+    },
+    reloadDescriptor: {
+      request: {
+        bypassCache: Option(0, "boolean"),
+      },
+      response: {},
+    },
+  },
+
+  events: {
+    "descriptor-destroyed": {
+      type: "descriptor-destroyed",
+    },
+  },
+});
+
+exports.tabDescriptorSpec = tabDescriptorSpec;
diff --git a/devtools/shared/specs/descriptors/webextension.js b/devtools/shared/specs/descriptors/webextension.js
new file mode 100644
index 0000000000..692896fc0a
--- /dev/null
+++ b/devtools/shared/specs/descriptors/webextension.js
@@ -0,0 +1,58 @@
+/* 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";
+
+const {
+  RetVal,
+  generateActorSpec,
+  Option,
+} = require("resource://devtools/shared/protocol.js");
+
+const webExtensionDescriptorSpec = generateActorSpec({
+  typeName: "webExtensionDescriptor",
+
+  methods: {
+    reload: {
+      request: {},
+      response: { addon: RetVal("json") },
+    },
+
+    terminateBackgroundScript: {
+      request: {},
+      response: {},
+    },
+
+    // @backward-compat { version 70 } The method is now called getTarget
+    connect: {
+      request: {},
+      response: { form: RetVal("json") },
+    },
+
+    getTarget: {
+      request: {},
+      response: { form: RetVal("json") },
+    },
+
+    reloadDescriptor: {
+      request: {
+        bypassCache: Option(0, "boolean"),
+      },
+      response: {},
+    },
+    getWatcher: {
+      request: {
+        isServerTargetSwitchingEnabled: Option(0, "boolean"),
+      },
+      response: RetVal("watcher"),
+    },
+  },
+
+  events: {
+    "descriptor-destroyed": {
+      type: "descriptor-destroyed",
+    },
+  },
+});
+
+exports.webExtensionDescriptorSpec = webExtensionDescriptorSpec;
diff --git a/devtools/shared/specs/descriptors/worker.js b/devtools/shared/specs/descriptors/worker.js
new file mode 100644
index 0000000000..1bf21bcc0a
--- /dev/null
+++ b/devtools/shared/specs/descriptors/worker.js
@@ -0,0 +1,32 @@
+/* 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";
+
+const {
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const workerDescriptorSpec = generateActorSpec({
+  typeName: "workerDescriptor",
+
+  methods: {
+    detach: {
+      request: {},
+      response: {},
+    },
+    getTarget: {
+      request: {},
+      response: RetVal("json"),
+    },
+  },
+
+  events: {
+    "descriptor-destroyed": {
+      type: "descriptor-destroyed",
+    },
+  },
+});
+
+exports.workerDescriptorSpec = workerDescriptorSpec;
diff --git a/devtools/shared/specs/device.js b/devtools/shared/specs/device.js
new file mode 100644
index 0000000000..cfe392950d
--- /dev/null
+++ b/devtools/shared/specs/device.js
@@ -0,0 +1,18 @@
+/* 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";
+
+const {
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+const deviceSpec = generateActorSpec({
+  typeName: "device",
+
+  methods: {
+    getDescription: { request: {}, response: { value: RetVal("json") } },
+  },
+});
+
+exports.deviceSpec = deviceSpec;
diff --git a/devtools/shared/specs/environment.js b/devtools/shared/specs/environment.js
new file mode 100644
index 0000000000..e98d906838
--- /dev/null
+++ b/devtools/shared/specs/environment.js
@@ -0,0 +1,14 @@
+/* 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";
+
+const { generateActorSpec } = require("resource://devtools/shared/protocol.js");
+
+const environmentSpec = generateActorSpec({
+  typeName: "environment",
+
+  methods: {},
+});
+
+exports.environmentSpec = environmentSpec;
diff --git a/devtools/shared/specs/frame.js b/devtools/shared/specs/frame.js
new file mode 100644
index 0000000000..03127e1d9f
--- /dev/null
+++ b/devtools/shared/specs/frame.js
@@ -0,0 +1,21 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const frameSpec = generateActorSpec({
+  typeName: "frame",
+
+  methods: {
+    getEnvironment: {
+      response: RetVal("json"),
+    },
+  },
+});
+
+exports.frameSpec = frameSpec;
diff --git a/devtools/shared/specs/heap-snapshot-file.js b/devtools/shared/specs/heap-snapshot-file.js
new file mode 100644
index 0000000000..9153fce005
--- /dev/null
+++ b/devtools/shared/specs/heap-snapshot-file.js
@@ -0,0 +1,23 @@
+/* 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";
+
+const {
+  Arg,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const heapSnapshotFileSpec = generateActorSpec({
+  typeName: "heapSnapshotFile",
+
+  methods: {
+    transferHeapSnapshot: {
+      request: {
+        snapshotId: Arg(0, "string"),
+      },
+    },
+  },
+});
+
+exports.heapSnapshotFileSpec = heapSnapshotFileSpec;
diff --git a/devtools/shared/specs/highlighters.js b/devtools/shared/specs/highlighters.js
new file mode 100644
index 0000000000..94d437f797
--- /dev/null
+++ b/devtools/shared/specs/highlighters.js
@@ -0,0 +1,44 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const customHighlighterSpec = generateActorSpec({
+  typeName: "customhighlighter",
+
+  events: {
+    "highlighter-event": {
+      type: "highlighter-event",
+      data: Arg(0, "json"),
+    },
+  },
+
+  methods: {
+    release: {
+      release: true,
+    },
+    show: {
+      request: {
+        node: Arg(0, "nullable:domnode"),
+        options: Arg(1, "nullable:json"),
+      },
+      response: {
+        value: RetVal("nullable:boolean"),
+      },
+    },
+    hide: {
+      request: {},
+    },
+    finalize: {
+      oneway: true,
+    },
+  },
+});
+
+exports.customHighlighterSpec = customHighlighterSpec;
diff --git a/devtools/shared/specs/index.js b/devtools/shared/specs/index.js
new file mode 100644
index 0000000000..29f04c4b2f
--- /dev/null
+++ b/devtools/shared/specs/index.js
@@ -0,0 +1,404 @@
+/* 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";
+
+// Registry indexing all specs and front modules
+//
+// All spec and front modules should be listed here
+// in order to be referenced by any other spec or front module.
+
+// Declare in which spec module and front module a set of types are defined.
+// This array should be sorted by `spec` attribute, and this is verified in the
+// test devtools/shared/protocol/tests/xpcshell/test_protocol_index.js
+const Types = (exports.__TypesForTests = [
+  {
+    types: [
+      "accessible",
+      "accessiblewalker",
+      "accessibility",
+      "parentaccessibility",
+    ],
+    spec: "devtools/shared/specs/accessibility",
+    front: "devtools/client/fronts/accessibility",
+  },
+  {
+    types: ["addons"],
+    spec: "devtools/shared/specs/addon/addons",
+    front: "devtools/client/fronts/addon/addons",
+  },
+  {
+    types: ["webExtensionInspectedWindow"],
+    spec: "devtools/shared/specs/addon/webextension-inspected-window",
+    front: "devtools/client/fronts/addon/webextension-inspected-window",
+  },
+  {
+    types: ["animationplayer", "animations"],
+    spec: "devtools/shared/specs/animation",
+    front: "devtools/client/fronts/animation",
+  },
+  {
+    types: ["arraybuffer"],
+    spec: "devtools/shared/specs/array-buffer",
+    front: "devtools/client/fronts/array-buffer",
+  },
+  {
+    types: ["blackboxing"],
+    spec: "devtools/shared/specs/blackboxing",
+    front: "devtools/client/fronts/blackboxing",
+  },
+  {
+    types: ["breakpoint-list"],
+    spec: "devtools/shared/specs/breakpoint-list",
+    front: "devtools/client/fronts/breakpoint-list",
+  },
+  {
+    types: ["changes"],
+    spec: "devtools/shared/specs/changes",
+    front: "devtools/client/fronts/changes",
+  },
+  {
+    types: ["compatibility"],
+    spec: "devtools/shared/specs/compatibility",
+    front: "devtools/client/fronts/compatibility",
+  },
+  {
+    types: ["cssProperties"],
+    spec: "devtools/shared/specs/css-properties",
+    front: "devtools/client/fronts/css-properties",
+  },
+  {
+    types: ["processDescriptor"],
+    spec: "devtools/shared/specs/descriptors/process",
+    front: "devtools/client/fronts/descriptors/process",
+  },
+  {
+    types: ["tabDescriptor"],
+    spec: "devtools/shared/specs/descriptors/tab",
+    front: "devtools/client/fronts/descriptors/tab",
+  },
+  {
+    types: ["webExtensionDescriptor"],
+    spec: "devtools/shared/specs/descriptors/webextension",
+    front: "devtools/client/fronts/descriptors/webextension",
+  },
+  {
+    types: ["workerDescriptor"],
+    spec: "devtools/shared/specs/descriptors/worker",
+    front: "devtools/client/fronts/descriptors/worker",
+  },
+  {
+    types: ["device"],
+    spec: "devtools/shared/specs/device",
+    front: "devtools/client/fronts/device",
+  },
+  {
+    types: ["environment"],
+    spec: "devtools/shared/specs/environment",
+    front: null,
+  },
+  {
+    types: ["frame"],
+    spec: "devtools/shared/specs/frame",
+    front: "devtools/client/fronts/frame",
+  },
+  /* heap snapshot has old fashion client and no front */
+  {
+    types: ["heapSnapshotFile"],
+    spec: "devtools/shared/specs/heap-snapshot-file",
+    front: null,
+  },
+  {
+    types: ["customhighlighter"],
+    spec: "devtools/shared/specs/highlighters",
+    front: "devtools/client/fronts/highlighters",
+  },
+  {
+    types: ["inspector"],
+    spec: "devtools/shared/specs/inspector",
+    front: "devtools/client/fronts/inspector",
+  },
+  {
+    types: ["flexbox", "grid", "layout"],
+    spec: "devtools/shared/specs/layout",
+    front: "devtools/client/fronts/layout",
+  },
+  {
+    types: ["manifest"],
+    spec: "devtools/shared/specs/manifest",
+    front: "devtools/client/fronts/manifest",
+  },
+  {
+    types: ["memory"],
+    spec: "devtools/shared/specs/memory",
+    front: "devtools/client/fronts/memory",
+  },
+  {
+    types: ["networkContent"],
+    spec: "devtools/shared/specs/network-content",
+    front: "devtools/client/fronts/network-content",
+  },
+  {
+    types: ["netEvent"],
+    spec: "devtools/shared/specs/network-event",
+    front: null,
+  },
+  {
+    types: ["networkParent"],
+    spec: "devtools/shared/specs/network-parent",
+    front: "devtools/client/fronts/network-parent",
+  },
+  /* imageData isn't an actor but just a DictType */
+  {
+    types: ["imageData", "disconnectedNode", "disconnectedNodeArray"],
+    spec: "devtools/shared/specs/node",
+    front: null,
+  },
+  {
+    types: ["domnode", "domnodelist"],
+    spec: "devtools/shared/specs/node",
+    front: "devtools/client/fronts/node",
+  },
+  {
+    types: ["obj", "object.descriptor"],
+    spec: "devtools/shared/specs/object",
+    front: null,
+  },
+  {
+    types: ["pagestyle"],
+    spec: "devtools/shared/specs/page-style",
+    front: "devtools/client/fronts/page-style",
+  },
+  {
+    types: ["perf"],
+    spec: "devtools/shared/specs/perf",
+    front: "devtools/client/fronts/perf",
+  },
+  {
+    types: ["preference"],
+    spec: "devtools/shared/specs/preference",
+    front: "devtools/client/fronts/preference",
+  },
+  {
+    types: ["privatePropertiesIterator"],
+    spec: "devtools/shared/specs/private-properties-iterator",
+    front: "devtools/client/fronts/private-properties-iterator",
+  },
+  {
+    types: ["propertyIterator"],
+    spec: "devtools/shared/specs/property-iterator",
+    front: "devtools/client/fronts/property-iterator",
+  },
+  {
+    types: ["reflow"],
+    spec: "devtools/shared/specs/reflow",
+    front: "devtools/client/fronts/reflow",
+  },
+  {
+    types: ["responsive"],
+    spec: "devtools/shared/specs/responsive",
+    front: "devtools/client/fronts/responsive",
+  },
+  {
+    types: ["root"],
+    spec: "devtools/shared/specs/root",
+    front: "devtools/client/fronts/root",
+  },
+  {
+    types: ["screenshot"],
+    spec: "devtools/shared/specs/screenshot",
+    front: "devtools/client/fronts/screenshot",
+  },
+  {
+    types: ["screenshot-content"],
+    spec: "devtools/shared/specs/screenshot-content",
+    front: "devtools/client/fronts/screenshot-content",
+  },
+  {
+    types: ["source"],
+    spec: "devtools/shared/specs/source",
+    front: "devtools/client/fronts/source",
+  },
+  {
+    types: [
+      "Cache",
+      "cookies",
+      "localStorage",
+      "extensionStorage",
+      "indexedDB",
+      "sessionStorage",
+    ],
+    spec: "devtools/shared/specs/storage",
+    front: "devtools/client/fronts/storage",
+  },
+  /* longstring is special, it has a wrapper type. See its spec module */
+  {
+    types: ["longstring"],
+    spec: "devtools/shared/specs/string",
+    front: null,
+  },
+  {
+    types: ["longstractor"],
+    spec: "devtools/shared/specs/string",
+    front: "devtools/client/fronts/string",
+  },
+  {
+    types: ["domstylerule"],
+    spec: "devtools/shared/specs/style-rule",
+    front: "devtools/client/fronts/style-rule",
+  },
+  {
+    types: ["stylesheets"],
+    spec: "devtools/shared/specs/style-sheets",
+    front: "devtools/client/fronts/style-sheets",
+  },
+  {
+    types: ["symbol"],
+    spec: "devtools/shared/specs/symbol",
+    front: null,
+  },
+  {
+    types: ["symbolIterator"],
+    spec: "devtools/shared/specs/symbol-iterator",
+    front: "devtools/client/fronts/symbol-iterator",
+  },
+  {
+    types: ["target-configuration"],
+    spec: "devtools/shared/specs/target-configuration",
+    front: "devtools/client/fronts/target-configuration",
+  },
+  {
+    types: ["contentProcessTarget"],
+    spec: "devtools/shared/specs/targets/content-process",
+    front: null,
+  },
+  {
+    types: ["parentProcessTarget"],
+    spec: "devtools/shared/specs/targets/parent-process",
+    front: null,
+  },
+  {
+    types: ["webExtensionTarget"],
+    spec: "devtools/shared/specs/targets/webextension",
+    front: null,
+  },
+  {
+    types: ["windowGlobalTarget"],
+    spec: "devtools/shared/specs/targets/window-global",
+    front: "devtools/client/fronts/targets/window-global",
+  },
+  {
+    types: ["workerTarget"],
+    spec: "devtools/shared/specs/targets/worker",
+    front: "devtools/client/fronts/targets/worker",
+  },
+  {
+    types: ["thread"],
+    spec: "devtools/shared/specs/thread",
+    front: "devtools/client/fronts/thread",
+  },
+  {
+    types: ["thread-configuration"],
+    spec: "devtools/shared/specs/thread-configuration",
+    front: "devtools/client/fronts/thread-configuration",
+  },
+  {
+    types: ["tracer"],
+    spec: "devtools/shared/specs/tracer",
+    front: "devtools/client/fronts/tracer",
+  },
+  {
+    types: ["domwalker"],
+    spec: "devtools/shared/specs/walker",
+    front: "devtools/client/fronts/walker",
+  },
+  {
+    types: ["watcher"],
+    spec: "devtools/shared/specs/watcher",
+    front: "devtools/client/fronts/watcher",
+  },
+  {
+    types: ["console"],
+    spec: "devtools/shared/specs/webconsole",
+    front: "devtools/client/fronts/webconsole",
+  },
+  {
+    types: ["pushSubscription"],
+    spec: "devtools/shared/specs/worker/push-subscription",
+    front: "devtools/client/fronts/worker/push-subscription",
+  },
+  {
+    types: ["serviceWorker"],
+    spec: "devtools/shared/specs/worker/service-worker",
+    front: "devtools/client/fronts/worker/service-worker",
+  },
+  {
+    types: ["serviceWorkerRegistration"],
+    spec: "devtools/shared/specs/worker/service-worker-registration",
+    front: "devtools/client/fronts/worker/service-worker-registration",
+  },
+]);
+
+const lazySpecs = new Map();
+const lazyFronts = new Map();
+
+// Convert the human readable `Types` list into efficient maps
+Types.forEach(item => {
+  item.types.forEach(type => {
+    lazySpecs.set(type, item.spec);
+    lazyFronts.set(type, item.front);
+  });
+});
+
+/**
+ * Try lazy loading spec module for the given type.
+ *
+ * @param [string] type
+ *    Type name
+ *
+ * @returns true, if it matched a lazy loaded type and tried to load it.
+ */
+function lazyLoadSpec(type) {
+  const modulePath = lazySpecs.get(type);
+  if (modulePath) {
+    try {
+      require(modulePath);
+    } catch (e) {
+      throw new Error(
+        `Unable to load lazy spec module '${modulePath}' for type '${type}'.
+        Error: ${e}`
+      );
+    }
+    lazySpecs.delete(type);
+    return true;
+  }
+  return false;
+}
+exports.lazyLoadSpec = lazyLoadSpec;
+
+/**
+ * Try lazy loading front module for the given type.
+ *
+ * @param [string] type
+ *    Type name
+ *
+ * @returns true, if it matched a lazy loaded type and tried to load it.
+ */
+function lazyLoadFront(type) {
+  const modulePath = lazyFronts.get(type);
+  if (modulePath) {
+    try {
+      require(modulePath);
+    } catch (e) {
+      throw new Error(
+        `Unable to load lazy front module '${modulePath}' for type '${type}'.
+        Error: ${e}`
+      );
+    }
+    lazyFronts.delete(type);
+    return true;
+  }
+  return false;
+}
+exports.lazyLoadFront = lazyLoadFront;
diff --git a/devtools/shared/specs/inspector.js b/devtools/shared/specs/inspector.js
new file mode 100644
index 0000000000..949532f9c4
--- /dev/null
+++ b/devtools/shared/specs/inspector.js
@@ -0,0 +1,79 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const inspectorSpec = generateActorSpec({
+  typeName: "inspector",
+
+  events: {
+    "color-picked": {
+      type: "colorPicked",
+      color: Arg(0, "string"),
+    },
+    "color-pick-canceled": {
+      type: "colorPickCanceled",
+    },
+  },
+
+  methods: {
+    getWalker: {
+      request: {
+        options: Arg(0, "nullable:json"),
+      },
+      response: {
+        walker: RetVal("domwalker"),
+      },
+    },
+    getPageStyle: {
+      request: {},
+      response: {
+        pageStyle: RetVal("pagestyle"),
+      },
+    },
+    getCompatibility: {
+      request: {},
+      response: {
+        compatibility: RetVal("compatibility"),
+      },
+    },
+    getHighlighterByType: {
+      request: {
+        typeName: Arg(0),
+      },
+      response: {
+        highlighter: RetVal("nullable:customhighlighter"),
+      },
+    },
+    getImageDataFromURL: {
+      request: { url: Arg(0), maxDim: Arg(1, "nullable:number") },
+      response: RetVal("imageData"),
+    },
+    resolveRelativeURL: {
+      request: { url: Arg(0, "string"), node: Arg(1, "nullable:domnode") },
+      response: { value: RetVal("string") },
+    },
+    pickColorFromPage: {
+      request: { options: Arg(0, "nullable:json") },
+      response: {},
+    },
+    cancelPickColorFromPage: {
+      request: {},
+      response: {},
+    },
+    supportsHighlighters: {
+      request: {},
+      response: {
+        value: RetVal("boolean"),
+      },
+    },
+  },
+});
+
+exports.inspectorSpec = inspectorSpec;
diff --git a/devtools/shared/specs/layout.js b/devtools/shared/specs/layout.js
new file mode 100644
index 0000000000..69371cd023
--- /dev/null
+++ b/devtools/shared/specs/layout.js
@@ -0,0 +1,75 @@
+/* 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";
+
+const {
+  Arg,
+  generateActorSpec,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const flexboxSpec = generateActorSpec({
+  typeName: "flexbox",
+
+  methods: {
+    getFlexItems: {
+      request: {},
+      response: {
+        flexitems: RetVal("array:flexitem"),
+      },
+    },
+  },
+});
+
+const flexItemSpec = generateActorSpec({
+  typeName: "flexitem",
+
+  methods: {},
+});
+
+const gridSpec = generateActorSpec({
+  typeName: "grid",
+
+  methods: {},
+});
+
+const layoutSpec = generateActorSpec({
+  typeName: "layout",
+
+  methods: {
+    getCurrentFlexbox: {
+      request: {
+        node: Arg(0, "domnode"),
+        onlyLookAtParents: Arg(1, "nullable:boolean"),
+      },
+      response: {
+        flexbox: RetVal("nullable:flexbox"),
+      },
+    },
+
+    getCurrentGrid: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {
+        grid: RetVal("nullable:grid"),
+      },
+    },
+
+    getGrids: {
+      request: {
+        rootNode: Arg(0, "domnode"),
+      },
+      response: {
+        grids: RetVal("array:grid"),
+      },
+    },
+  },
+});
+
+exports.flexboxSpec = flexboxSpec;
+exports.flexItemSpec = flexItemSpec;
+exports.gridSpec = gridSpec;
+exports.layoutSpec = layoutSpec;
diff --git a/devtools/shared/specs/manifest.js b/devtools/shared/specs/manifest.js
new file mode 100644
index 0000000000..ecddacca33
--- /dev/null
+++ b/devtools/shared/specs/manifest.js
@@ -0,0 +1,21 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const manifestSpec = generateActorSpec({
+  typeName: "manifest",
+  methods: {
+    fetchCanonicalManifest: {
+      request: {},
+      response: RetVal("json"),
+    },
+  },
+});
+
+exports.manifestSpec = manifestSpec;
diff --git a/devtools/shared/specs/memory.js b/devtools/shared/specs/memory.js
new file mode 100644
index 0000000000..b70999c9f1
--- /dev/null
+++ b/devtools/shared/specs/memory.js
@@ -0,0 +1,124 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  types,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("AllocationsRecordingOptions", {
+  // The probability we sample any given allocation when recording
+  // allocations. Must be between 0.0 and 1.0. Defaults to 1.0, or sampling
+  // every allocation.
+  probability: "number",
+
+  // The maximum number of of allocation events to keep in the allocations
+  // log. If new allocations arrive, when we are already at capacity, the oldest
+  // allocation event is lost. This number must fit in a 32 bit signed integer.
+  maxLogLength: "number",
+});
+
+const memorySpec = generateActorSpec({
+  typeName: "memory",
+
+  /**
+   * The set of unsolicited events the MemoryActor emits that will be sent over
+   * the RDP (by protocol.js).
+   */
+  events: {
+    // Same format as the data passed to the
+    // `Debugger.Memory.prototype.onGarbageCollection` hook. See
+    // `js/src/doc/Debugger/Debugger.Memory.md` for documentation.
+    "garbage-collection": {
+      type: "garbage-collection",
+      data: Arg(0, "json"),
+    },
+
+    // Same data as the data from `getAllocations` -- only fired if
+    // `autoDrain` set during `startRecordingAllocations`.
+    allocations: {
+      type: "allocations",
+      data: Arg(0, "json"),
+    },
+  },
+
+  methods: {
+    attach: {
+      request: {},
+      response: {
+        type: RetVal("string"),
+      },
+    },
+    detach: {
+      request: {},
+      response: {
+        type: RetVal("string"),
+      },
+    },
+    getState: {
+      response: {
+        state: RetVal(0, "string"),
+      },
+    },
+    takeCensus: {
+      request: {},
+      response: RetVal("json"),
+    },
+    startRecordingAllocations: {
+      request: {
+        options: Arg(0, "nullable:AllocationsRecordingOptions"),
+      },
+      response: {
+        // Accept `nullable` in the case of server Gecko <= 37, handled on the front
+        value: RetVal(0, "nullable:number"),
+      },
+    },
+    stopRecordingAllocations: {
+      request: {},
+      response: {
+        // Accept `nullable` in the case of server Gecko <= 37, handled on the front
+        value: RetVal(0, "nullable:number"),
+      },
+    },
+    getAllocationsSettings: {
+      request: {},
+      response: {
+        options: RetVal(0, "json"),
+      },
+    },
+    getAllocations: {
+      request: {},
+      response: RetVal("json"),
+    },
+    forceGarbageCollection: {
+      request: {},
+      response: {},
+    },
+    forceCycleCollection: {
+      request: {},
+      response: {},
+    },
+    measure: {
+      request: {},
+      response: RetVal("json"),
+    },
+    residentUnique: {
+      request: {},
+      response: { value: RetVal("number") },
+    },
+    saveHeapSnapshot: {
+      request: {
+        boundaries: Arg(0, "nullable:json"),
+      },
+      response: {
+        snapshotId: RetVal("string"),
+      },
+    },
+  },
+});
+
+exports.memorySpec = memorySpec;
diff --git a/devtools/shared/specs/moz.build b/devtools/shared/specs/moz.build
new file mode 100644
index 0000000000..dd917465ad
--- /dev/null
+++ b/devtools/shared/specs/moz.build
@@ -0,0 +1,63 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+DIRS += [
+    "addon",
+    "descriptors",
+    "style",
+    "targets",
+    "worker",
+]
+
+DevToolsModules(
+    "accessibility.js",
+    "animation.js",
+    "array-buffer.js",
+    "blackboxing.js",
+    "breakpoint-list.js",
+    "changes.js",
+    "compatibility.js",
+    "css-properties.js",
+    "device.js",
+    "environment.js",
+    "frame.js",
+    "heap-snapshot-file.js",
+    "highlighters.js",
+    "index.js",
+    "inspector.js",
+    "layout.js",
+    "manifest.js",
+    "memory.js",
+    "network-content.js",
+    "network-event.js",
+    "network-parent.js",
+    "node.js",
+    "object.js",
+    "page-style.js",
+    "perf.js",
+    "preference.js",
+    "private-properties-iterator.js",
+    "property-iterator.js",
+    "reflow.js",
+    "responsive.js",
+    "root.js",
+    "screenshot-content.js",
+    "screenshot.js",
+    "source.js",
+    "storage.js",
+    "string.js",
+    "style-rule.js",
+    "style-sheets.js",
+    "symbol-iterator.js",
+    "symbol.js",
+    "target-configuration.js",
+    "thread-configuration.js",
+    "thread.js",
+    "tracer.js",
+    "walker.js",
+    "watcher.js",
+    "webconsole.js",
+)
diff --git a/devtools/shared/specs/network-content.js b/devtools/shared/specs/network-content.js
new file mode 100644
index 0000000000..4c262ea59b
--- /dev/null
+++ b/devtools/shared/specs/network-content.js
@@ -0,0 +1,32 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  RetVal,
+  Arg,
+} = require("resource://devtools/shared/protocol.js");
+
+const networkContentSpec = generateActorSpec({
+  typeName: "networkContent",
+  methods: {
+    sendHTTPRequest: {
+      request: {
+        request: Arg(0, "json"),
+      },
+      response: RetVal("number"),
+    },
+    getStackTrace: {
+      request: { resourceId: Arg(0) },
+      response: {
+        // stacktrace is an "array:string", but not always.
+        stacktrace: RetVal("json"),
+      },
+    },
+  },
+});
+
+exports.networkContentSpec = networkContentSpec;
diff --git a/devtools/shared/specs/network-event.js b/devtools/shared/specs/network-event.js
new file mode 100644
index 0000000000..3f1cfe8538
--- /dev/null
+++ b/devtools/shared/specs/network-event.js
@@ -0,0 +1,220 @@
+/* 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";
+
+const {
+  Arg,
+  Option,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("netevent.headers-cookies", {
+  name: "string",
+  value: "longstring",
+});
+
+types.addDictType("netevent.headers", {
+  headers: "array:netevent.headers-cookies",
+  headersSize: "number",
+  rawHeaders: "nullable:longstring",
+});
+
+types.addDictType("netevent.cookies", {
+  cookies: "array:netevent.headers-cookies",
+});
+
+types.addDictType("netevent.postdata.text", {
+  text: "longstring",
+});
+
+types.addDictType("netevent.postdata", {
+  postData: "netevent.postdata.text",
+  postDataDiscarded: "boolean",
+});
+
+types.addDictType("netevent.cache", {
+  content: "json",
+});
+
+types.addDictType("netevent.content.content", {
+  text: "longstring",
+});
+
+types.addDictType("netevent.content", {
+  content: "netevent.content.content",
+  contentDiscarded: "boolean",
+});
+
+types.addDictType("netevent.timings.data", {
+  blocked: "number",
+  dns: "number",
+  ssl: "number",
+  connect: "number",
+  send: "number",
+  wait: "number",
+  receive: "number",
+});
+
+types.addDictType("netevent.timings", {
+  timings: "netevent.timings.data",
+  totalTime: "number",
+  offsets: "netevent.timings.data",
+  serverTimings: "array:netevent.timings.serverTiming",
+});
+
+types.addDictType("netevent.timings.serverTiming", {
+  name: "string",
+  description: "string",
+  duration: "number",
+});
+
+// See NetworkHelper.parseCertificateInfo for more details
+types.addDictType("netevent.cert", {
+  subject: "json",
+  issuer: "json",
+  validity: "json",
+  fingerprint: "json",
+});
+
+types.addDictType("netevent.secinfo", {
+  state: "string",
+  weaknessReasons: "array:string",
+  cipherSuite: "string",
+  keaGroupName: "string",
+  signatureSchemeName: "string",
+  protocolVersion: "string",
+  cert: "nullable:netevent.cert",
+  certificateTransparency: "number",
+  hsts: "boolean",
+  hpkp: "boolean",
+  errorMessage: "nullable:string",
+  usedEch: "boolean",
+  usedDelegatedCredentials: "boolean",
+  usedOcsp: "boolean",
+  usedPrivateDns: "boolean",
+});
+
+const networkEventSpec = generateActorSpec({
+  typeName: "netEvent",
+
+  events: {
+    // All these events end up emitting a `networkEventUpdate` RDP message
+    // `updateType` attribute allows to identify which kind of event is emitted.
+    // We use individual event at protocol.js level to workaround performance issue
+    // with `Option` types. (See bug 1449162)
+    "network-event-update:headers": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      headers: Option(1, "number"),
+      headersSize: Option(1, "number"),
+    },
+
+    "network-event-update:cookies": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      cookies: Option(1, "number"),
+    },
+
+    "network-event-update:post-data": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      dataSize: Option(1, "number"),
+    },
+
+    "network-event-update:response-start": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      response: Option(1, "json"),
+    },
+
+    "network-event-update:security-info": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      state: Option(1, "string"),
+      isRacing: Option(1, "boolean"),
+    },
+
+    "network-event-update:response-content": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      mimeType: Option(1, "string"),
+      contentSize: Option(1, "number"),
+      encoding: Option(1, "string"),
+      transferredSize: Option(1, "number"),
+      blockedReason: Option(1, "number"),
+      blockingExtension: Option(1, "string"),
+    },
+
+    "network-event-update:event-timings": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+
+      totalTime: Option(1, "number"),
+    },
+
+    "network-event-update:response-cache": {
+      type: "networkEventUpdate",
+      updateType: Arg(0, "string"),
+    },
+  },
+
+  methods: {
+    release: {
+      // This makes protocol.js call destroy method
+      release: true,
+    },
+    getRequestHeaders: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getRequestCookies: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getRequestPostData: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getResponseHeaders: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getResponseCookies: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getResponseCache: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getResponseContent: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getEventTimings: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getSecurityInfo: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getStackTrace: {
+      request: {},
+      // stacktrace is an "array:string", but not always.
+      response: RetVal("json"),
+    },
+  },
+});
+
+exports.networkEventSpec = networkEventSpec;
diff --git a/devtools/shared/specs/network-parent.js b/devtools/shared/specs/network-parent.js
new file mode 100644
index 0000000000..7438081eea
--- /dev/null
+++ b/devtools/shared/specs/network-parent.js
@@ -0,0 +1,82 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const networkParentSpec = generateActorSpec({
+  typeName: "networkParent",
+
+  methods: {
+    setPersist: {
+      request: {
+        options: Arg(0, "boolean"),
+      },
+      response: {},
+    },
+    setNetworkThrottling: {
+      request: {
+        options: Arg(0, "json"),
+      },
+      response: {},
+    },
+    getNetworkThrottling: {
+      request: {},
+      response: {
+        state: RetVal("json"),
+      },
+    },
+    clearNetworkThrottling: {
+      request: {},
+      response: {},
+    },
+    setSaveRequestAndResponseBodies: {
+      request: {
+        save: Arg(0, "boolean"),
+      },
+      response: {},
+    },
+    setBlockedUrls: {
+      request: {
+        urls: Arg(0, "array:string"),
+      },
+    },
+    getBlockedUrls: {
+      request: {},
+      response: {
+        urls: RetVal("array:string"),
+      },
+    },
+    blockRequest: {
+      request: {
+        filters: Arg(0, "json"),
+      },
+      response: {},
+    },
+    unblockRequest: {
+      request: {
+        filters: Arg(0, "json"),
+      },
+      response: {},
+    },
+    override: {
+      request: {
+        url: Arg(0, "string"),
+        path: Arg(1, "string"),
+      },
+    },
+    removeOverride: {
+      request: {
+        url: Arg(0, "string"),
+      },
+    },
+  },
+});
+
+exports.networkParentSpec = networkParentSpec;
diff --git a/devtools/shared/specs/node.js b/devtools/shared/specs/node.js
new file mode 100644
index 0000000000..1daeb48a33
--- /dev/null
+++ b/devtools/shared/specs/node.js
@@ -0,0 +1,160 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("imageData", {
+  // The image data
+  data: "nullable:longstring",
+  // The original image dimensions
+  size: "json",
+});
+
+types.addDictType("windowDimensions", {
+  // The window innerWidth
+  innerWidth: "nullable:number",
+  // The window innerHeight
+  innerHeight: "nullable:number",
+});
+
+/**
+ * Returned from any call that might return a node that isn't connected to root
+ * by nodes the child has seen, such as querySelector.
+ */
+types.addDictType("disconnectedNode", {
+  // The actual node to return
+  node: "domnode",
+
+  // Nodes that are needed to connect the node to a node the client has already
+  // seen
+  newParents: "array:domnode",
+});
+
+types.addDictType("disconnectedNodeArray", {
+  // The actual node list to return
+  nodes: "array:domnode",
+
+  // Nodes that are needed to connect those nodes to the root.
+  newParents: "array:domnode",
+});
+
+const nodeListSpec = generateActorSpec({
+  typeName: "domnodelist",
+
+  methods: {
+    item: {
+      request: { item: Arg(0) },
+      response: RetVal("disconnectedNode"),
+    },
+    items: {
+      request: {
+        start: Arg(0, "nullable:number"),
+        end: Arg(1, "nullable:number"),
+      },
+      response: RetVal("disconnectedNodeArray"),
+    },
+    release: {
+      release: true,
+    },
+  },
+});
+
+exports.nodeListSpec = nodeListSpec;
+
+const nodeSpec = generateActorSpec({
+  typeName: "domnode",
+
+  methods: {
+    getNodeValue: {
+      request: {},
+      response: {
+        value: RetVal("longstring"),
+      },
+    },
+    setNodeValue: {
+      request: { value: Arg(0) },
+      response: {},
+    },
+    getUniqueSelector: {
+      request: {},
+      response: {
+        value: RetVal("string"),
+      },
+    },
+    getCssPath: {
+      request: {},
+      response: {
+        value: RetVal("string"),
+      },
+    },
+    getXPath: {
+      request: {},
+      response: {
+        value: RetVal("string"),
+      },
+    },
+    scrollIntoView: {
+      request: {},
+      response: {},
+    },
+    getImageData: {
+      request: { maxDim: Arg(0, "nullable:number") },
+      response: RetVal("imageData"),
+    },
+    getEventListenerInfo: {
+      request: {},
+      response: {
+        events: RetVal("json"),
+      },
+    },
+    enableEventListener: {
+      request: {
+        eventListenerInfoId: Arg(0),
+      },
+      response: {},
+    },
+    disableEventListener: {
+      request: {
+        eventListenerInfoId: Arg(0),
+      },
+      response: {},
+    },
+    modifyAttributes: {
+      request: {
+        modifications: Arg(0, "array:json"),
+      },
+      response: {},
+    },
+    getFontFamilyDataURL: {
+      request: { font: Arg(0, "string"), fillStyle: Arg(1, "nullable:string") },
+      response: RetVal("imageData"),
+    },
+    getClosestBackgroundColor: {
+      request: {},
+      response: {
+        value: RetVal("string"),
+      },
+    },
+    getBackgroundColor: {
+      request: {},
+      response: RetVal("json"),
+    },
+    getOwnerGlobalDimensions: {
+      request: {},
+      response: RetVal("windowDimensions"),
+    },
+    waitForFrameLoad: {
+      request: {},
+      response: {},
+    },
+  },
+});
+
+exports.nodeSpec = nodeSpec;
diff --git a/devtools/shared/specs/object.js b/devtools/shared/specs/object.js
new file mode 100644
index 0000000000..7af82cc419
--- /dev/null
+++ b/devtools/shared/specs/object.js
@@ -0,0 +1,214 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  RetVal,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("object.descriptor", {
+  configurable: "boolean",
+  enumerable: "boolean",
+  // Can be null if there is a getter for the property.
+  value: "nullable:json",
+  // Only set `value` exists.
+  writable: "nullable:boolean",
+  // Only set when `value` does not exist and there is a getter for the property.
+  get: "nullable:json",
+  // Only set when `value` does not exist and there is a setter for the property.
+  set: "nullable:json",
+});
+
+types.addDictType("object.completion", {
+  return: "nullable:json",
+  throw: "nullable:json",
+});
+
+types.addDictType("object.prototypeproperties", {
+  prototype: "object.descriptor",
+  ownProperties: "nullable:json",
+  ownSymbols: "nullable:array:object.descriptor",
+  safeGetterValues: "nullable:json",
+});
+
+types.addDictType("object.prototype", {
+  prototype: "object.descriptor",
+});
+
+types.addDictType("object.property", {
+  descriptor: "nullable:object.descriptor",
+});
+
+types.addDictType("object.propertyValue", {
+  value: "nullable:object.completion",
+});
+
+types.addDictType("object.apply", {
+  value: "nullable:object.completion",
+});
+
+types.addDictType("object.bindings", {
+  arguments: "array:json",
+  variables: "json",
+});
+
+types.addDictType("object.enumProperties.Options", {
+  enumEntries: "nullable:boolean",
+  ignoreNonIndexedProperties: "nullable:boolean",
+  ignoreIndexedProperties: "nullable:boolean",
+  query: "nullable:string",
+  sort: "nullable:boolean",
+});
+
+types.addDictType("object.dependentPromises", {
+  promises: "array:object.descriptor",
+});
+
+types.addDictType("object.originalSourceLocation", {
+  source: "source",
+  line: "number",
+  column: "number",
+  functionDisplayName: "string",
+});
+
+types.addDictType("object.promiseState", {
+  state: "string",
+  value: "nullable:object.descriptor",
+  reason: "nullable:object.descriptor",
+  creationTimestamp: "number",
+  timeToSettle: "nullable:number",
+});
+
+types.addDictType("object.proxySlots", {
+  proxyTarget: "object.descriptor",
+  proxyHandler: "object.descriptor",
+});
+
+types.addDictType("object.customFormatterBody", {
+  customFormatterBody: "json",
+});
+
+const objectSpec = generateActorSpec({
+  typeName: "obj",
+  methods: {
+    allocationStack: {
+      request: {},
+      response: {
+        allocationStack: RetVal("array:object.originalSourceLocation"),
+      },
+    },
+    dependentPromises: {
+      request: {},
+      response: RetVal("object.dependentPromises"),
+    },
+    enumEntries: {
+      request: {},
+      response: {
+        iterator: RetVal("propertyIterator"),
+      },
+    },
+    enumProperties: {
+      request: {
+        options: Arg(0, "nullable:object.enumProperties.Options"),
+      },
+      response: {
+        iterator: RetVal("propertyIterator"),
+      },
+    },
+    enumPrivateProperties: {
+      request: {},
+      response: {
+        iterator: RetVal("privatePropertiesIterator"),
+      },
+    },
+    enumSymbols: {
+      request: {},
+      response: {
+        iterator: RetVal("symbolIterator"),
+      },
+    },
+    fulfillmentStack: {
+      request: {},
+      response: {
+        fulfillmentStack: RetVal("array:object.originalSourceLocation"),
+      },
+    },
+    prototypeAndProperties: {
+      request: {},
+      response: RetVal("object.prototypeproperties"),
+    },
+    prototype: {
+      request: {},
+      response: RetVal("object.prototype"),
+    },
+    property: {
+      request: {
+        name: Arg(0, "string"),
+      },
+      response: RetVal("object.property"),
+    },
+    propertyValue: {
+      request: {
+        name: Arg(0, "string"),
+        receiverId: Arg(1, "nullable:string"),
+      },
+      response: RetVal("object.propertyValue"),
+    },
+    apply: {
+      request: {
+        context: Arg(0, "nullable:json"),
+        arguments: Arg(1, "nullable:array:json"),
+      },
+      response: RetVal("object.apply"),
+    },
+    rejectionStack: {
+      request: {},
+      response: {
+        rejectionStack: RetVal("array:object.originalSourceLocation"),
+      },
+    },
+    promiseState: {
+      request: {},
+      response: RetVal("object.promiseState"),
+    },
+    proxySlots: {
+      request: {},
+      response: RetVal("object.proxySlots"),
+    },
+    customFormatterBody: {
+      request: {},
+      response: RetVal("object.customFormatterBody"),
+    },
+    addWatchpoint: {
+      request: {
+        property: Arg(0, "string"),
+        label: Arg(1, "string"),
+        watchpointType: Arg(2, "string"),
+      },
+      oneway: true,
+    },
+    removeWatchpoint: {
+      request: {
+        property: Arg(0, "string"),
+      },
+      oneway: true,
+    },
+    removeWatchpoints: {
+      request: {},
+      oneway: true,
+    },
+    release: { release: true },
+    // Needed for the PauseScopedObjectActor which extends the ObjectActor.
+    threadGrip: {
+      request: {},
+      response: {},
+    },
+  },
+});
+
+exports.objectSpec = objectSpec;
diff --git a/devtools/shared/specs/page-style.js b/devtools/shared/specs/page-style.js
new file mode 100644
index 0000000000..ffdec07611
--- /dev/null
+++ b/devtools/shared/specs/page-style.js
@@ -0,0 +1,126 @@
+/* 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";
+
+const {
+  Arg,
+  Option,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+// Load the shared types for style actors
+require("resource://devtools/shared/specs/style/style-types.js");
+
+const pageStyleSpec = generateActorSpec({
+  typeName: "pagestyle",
+
+  events: {
+    "stylesheet-updated": {
+      type: "styleSheetUpdated",
+    },
+  },
+
+  methods: {
+    getComputed: {
+      request: {
+        node: Arg(0, "domnode"),
+        markMatched: Option(1, "boolean"),
+        onlyMatched: Option(1, "boolean"),
+        filter: Option(1, "string"),
+        filterProperties: Option(1, "nullable:array:string"),
+      },
+      response: {
+        computed: RetVal("json"),
+      },
+    },
+    getAllUsedFontFaces: {
+      request: {
+        includePreviews: Option(0, "boolean"),
+        includeVariations: Option(1, "boolean"),
+        previewText: Option(0, "string"),
+        previewFontSize: Option(0, "string"),
+        previewFillStyle: Option(0, "string"),
+      },
+      response: {
+        fontFaces: RetVal("array:fontface"),
+      },
+    },
+    getUsedFontFaces: {
+      request: {
+        node: Arg(0, "domnode"),
+        includePreviews: Option(1, "boolean"),
+        includeVariations: Option(1, "boolean"),
+        previewText: Option(1, "string"),
+        previewFontSize: Option(1, "string"),
+        previewFillStyle: Option(1, "string"),
+      },
+      response: {
+        fontFaces: RetVal("array:fontface"),
+      },
+    },
+    getMatchedSelectors: {
+      request: {
+        node: Arg(0, "domnode"),
+        property: Arg(1, "string"),
+        filter: Option(2, "string"),
+      },
+      response: RetVal(
+        types.addDictType("matchedselectorresponse", {
+          rules: "array:domstylerule",
+          matched: "array:matchedselector",
+        })
+      ),
+    },
+    getRule: {
+      request: {
+        ruleId: Arg(0, "string"),
+      },
+      response: {
+        rule: RetVal("nullable:domstylerule"),
+      },
+    },
+    getApplied: {
+      request: {
+        node: Arg(0, "domnode"),
+        inherited: Option(1, "boolean"),
+        matchedSelectors: Option(1, "boolean"),
+        skipPseudo: Option(1, "boolean"),
+        filter: Option(1, "string"),
+      },
+      response: RetVal("appliedStylesReturn"),
+    },
+    isPositionEditable: {
+      request: { node: Arg(0, "domnode") },
+      response: { value: RetVal("boolean") },
+    },
+    getLayout: {
+      request: {
+        node: Arg(0, "domnode"),
+        autoMargins: Option(1, "boolean"),
+      },
+      response: RetVal("json"),
+    },
+    addNewRule: {
+      request: {
+        node: Arg(0, "domnode"),
+        pseudoClasses: Arg(1, "nullable:array:string"),
+      },
+      response: RetVal("appliedStylesReturn"),
+    },
+    getAttributesInOwnerDocument: {
+      request: {
+        search: Arg(0, "string"),
+        attributeType: Arg(1, "string"),
+        node: Arg(2, "nullable:domnode"),
+      },
+      response: {
+        attributes: RetVal("array:string"),
+      },
+    },
+  },
+});
+
+exports.pageStyleSpec = pageStyleSpec;
diff --git a/devtools/shared/specs/perf.js b/devtools/shared/specs/perf.js
new file mode 100644
index 0000000000..de8f9ffb21
--- /dev/null
+++ b/devtools/shared/specs/perf.js
@@ -0,0 +1,90 @@
+/* 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";
+
+const {
+  Arg,
+  Option,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const perfDescription = {
+  typeName: "perf",
+
+  events: {
+    "profiler-started": {
+      type: "profiler-started",
+      entries: Arg(0, "number"),
+      interval: Arg(1, "number"),
+      features: Arg(2, "number"),
+      duration: Arg(3, "nullable:number"),
+      // The `activeTabID` option passed to `profiler_start` is used to
+      // determine the active tab when user starts the profiler.
+      // This is a parameter that is generated on the
+      // server, that's why we don't need to pass anything on `startProfiler`
+      // actor method. But we return this in "profiler-started" event because
+      // client may want to use that value.
+      activeTabID: Arg(4, "number"),
+    },
+    "profiler-stopped": {
+      type: "profiler-stopped",
+    },
+  },
+
+  methods: {
+    startProfiler: {
+      request: {
+        entries: Option(0, "number"),
+        duration: Option(0, "nullable:number"),
+        interval: Option(0, "number"),
+        features: Option(0, "array:string"),
+        threads: Option(0, "array:string"),
+      },
+      response: { value: RetVal("boolean") },
+    },
+
+    /**
+     * Returns null when unable to return the profile.
+     */
+    getProfileAndStopProfiler: {
+      request: {},
+      response: RetVal("nullable:json"),
+    },
+
+    stopProfilerAndDiscardProfile: {
+      request: {},
+      response: {},
+    },
+
+    getSymbolTable: {
+      request: {
+        debugPath: Arg(0, "string"),
+        breakpadId: Arg(1, "string"),
+      },
+      response: { value: RetVal("array:array:number") },
+    },
+
+    isActive: {
+      request: {},
+      response: { value: RetVal("boolean") },
+    },
+
+    isSupportedPlatform: {
+      request: {},
+      response: { value: RetVal("boolean") },
+    },
+
+    getSupportedFeatures: {
+      request: {},
+      response: { value: RetVal("array:string") },
+    },
+  },
+};
+
+exports.perfDescription = perfDescription;
+
+const perfSpec = generateActorSpec(perfDescription);
+
+exports.perfSpec = perfSpec;
diff --git a/devtools/shared/specs/preference.js b/devtools/shared/specs/preference.js
new file mode 100644
index 0000000000..b8d33261d4
--- /dev/null
+++ b/devtools/shared/specs/preference.js
@@ -0,0 +1,55 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const preferenceSpec = generateActorSpec({
+  typeName: "preference",
+
+  methods: {
+    getTraits: {
+      request: {},
+      response: { traits: RetVal("json") },
+    },
+    getBoolPref: {
+      request: { value: Arg(0) },
+      response: { value: RetVal("boolean") },
+    },
+    getCharPref: {
+      request: { value: Arg(0) },
+      response: { value: RetVal("string") },
+    },
+    getIntPref: {
+      request: { value: Arg(0) },
+      response: { value: RetVal("number") },
+    },
+    getAllPrefs: {
+      request: {},
+      response: { value: RetVal("json") },
+    },
+    setBoolPref: {
+      request: { name: Arg(0), value: Arg(1) },
+      response: {},
+    },
+    setCharPref: {
+      request: { name: Arg(0), value: Arg(1) },
+      response: {},
+    },
+    setIntPref: {
+      request: { name: Arg(0), value: Arg(1) },
+      response: {},
+    },
+    clearUserPref: {
+      request: { name: Arg(0) },
+      response: {},
+    },
+  },
+});
+
+exports.preferenceSpec = preferenceSpec;
diff --git a/devtools/shared/specs/private-properties-iterator.js b/devtools/shared/specs/private-properties-iterator.js
new file mode 100644
index 0000000000..ef967d0698
--- /dev/null
+++ b/devtools/shared/specs/private-properties-iterator.js
@@ -0,0 +1,42 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Option,
+  RetVal,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("privatepropertiesiterator.data", {
+  privateProperties: "array:privatepropertiesiterator.privateProperties",
+});
+
+types.addDictType("privatepropertiesiterator.privateProperties", {
+  name: "string",
+  descriptor: "nullable:object.descriptor",
+});
+
+const privatePropertiesIteratorSpec = generateActorSpec({
+  typeName: "privatePropertiesIterator",
+
+  methods: {
+    slice: {
+      request: {
+        start: Option(0, "number"),
+        count: Option(0, "number"),
+      },
+      response: RetVal("privatepropertiesiterator.data"),
+    },
+    all: {
+      request: {},
+      response: RetVal("privatepropertiesiterator.data"),
+    },
+    release: { release: true },
+  },
+});
+
+exports.privatePropertiesIteratorSpec = privatePropertiesIteratorSpec;
diff --git a/devtools/shared/specs/property-iterator.js b/devtools/shared/specs/property-iterator.js
new file mode 100644
index 0000000000..991a8cede1
--- /dev/null
+++ b/devtools/shared/specs/property-iterator.js
@@ -0,0 +1,45 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Option,
+  RetVal,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("propertyiterator.data", {
+  ownProperties: "nullable:json",
+});
+
+const propertyIteratorSpec = generateActorSpec({
+  typeName: "propertyIterator",
+
+  methods: {
+    names: {
+      request: {
+        indexes: Option(0, "array:number"),
+      },
+      response: {
+        names: RetVal("array:string"),
+      },
+    },
+    slice: {
+      request: {
+        start: Option(0, "number"),
+        count: Option(0, "number"),
+      },
+      response: RetVal("propertyiterator.data"),
+    },
+    all: {
+      request: {},
+      response: RetVal("propertyiterator.data"),
+    },
+    release: { release: true },
+  },
+});
+
+exports.propertyIteratorSpec = propertyIteratorSpec;
diff --git a/devtools/shared/specs/reflow.js b/devtools/shared/specs/reflow.js
new file mode 100644
index 0000000000..9a6993ecbb
--- /dev/null
+++ b/devtools/shared/specs/reflow.js
@@ -0,0 +1,36 @@
+/* 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";
+
+const {
+  Arg,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const reflowSpec = generateActorSpec({
+  typeName: "reflow",
+
+  events: {
+    /**
+     * The reflows event is emitted when reflows have been detected. The event
+     * is sent with an array of reflows that occured. Each item has the
+     * following properties:
+     * - start {Number}
+     * - end {Number}
+     * - isInterruptible {Boolean}
+     */
+    reflows: {
+      type: "reflows",
+      reflows: Arg(0, "array:json"),
+    },
+  },
+
+  methods: {
+    start: { oneway: true },
+    stop: { oneway: true },
+  },
+});
+
+exports.reflowSpec = reflowSpec;
diff --git a/devtools/shared/specs/responsive.js b/devtools/shared/specs/responsive.js
new file mode 100644
index 0000000000..49b04f7391
--- /dev/null
+++ b/devtools/shared/specs/responsive.js
@@ -0,0 +1,40 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const responsiveSpec = generateActorSpec({
+  typeName: "responsive",
+
+  methods: {
+    toggleTouchSimulator: {
+      request: {
+        options: Arg(0, "json"),
+      },
+      response: {
+        valueChanged: RetVal("boolean"),
+      },
+    },
+
+    setElementPickerState: {
+      request: {
+        state: Arg(0, "boolean"),
+        pickerType: Arg(1, "string"),
+      },
+      response: {},
+    },
+
+    dispatchOrientationChangeEvent: {
+      request: {},
+      response: {},
+    },
+  },
+});
+
+exports.responsiveSpec = responsiveSpec;
diff --git a/devtools/shared/specs/root.js b/devtools/shared/specs/root.js
new file mode 100644
index 0000000000..f48f3b6262
--- /dev/null
+++ b/devtools/shared/specs/root.js
@@ -0,0 +1,139 @@
+/* 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";
+
+const {
+  types,
+  generateActorSpec,
+  RetVal,
+  Arg,
+  Option,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("root.listWorkers", {
+  workers: "array:workerDescriptor",
+});
+types.addDictType("root.listServiceWorkerRegistrations", {
+  registrations: "array:serviceWorkerRegistration",
+});
+
+const rootSpecPrototype = {
+  typeName: "root",
+
+  methods: {
+    getRoot: {
+      request: {},
+      response: RetVal("json"),
+    },
+
+    listTabs: {
+      request: {},
+      response: {
+        tabs: RetVal("array:tabDescriptor"),
+      },
+    },
+
+    getTab: {
+      request: {
+        browserId: Option(0, "number"),
+      },
+      response: {
+        tab: RetVal("tabDescriptor"),
+      },
+    },
+
+    listAddons: {
+      request: {
+        iconDataURL: Option(0, "boolean"),
+      },
+      response: {
+        addons: RetVal("array:webExtensionDescriptor"),
+      },
+    },
+
+    listWorkers: {
+      request: {},
+      response: RetVal("root.listWorkers"),
+    },
+
+    listServiceWorkerRegistrations: {
+      request: {},
+      response: RetVal("root.listServiceWorkerRegistrations"),
+    },
+
+    listProcesses: {
+      request: {},
+      response: {
+        processes: RetVal("array:processDescriptor"),
+      },
+    },
+
+    getProcess: {
+      request: {
+        id: Arg(0, "number"),
+      },
+      response: {
+        processDescriptor: RetVal("processDescriptor"),
+      },
+    },
+
+    watchResources: {
+      request: {
+        resourceTypes: Arg(0, "array:string"),
+      },
+      response: {},
+    },
+
+    unwatchResources: {
+      request: {
+        resourceTypes: Arg(0, "array:string"),
+      },
+      oneway: true,
+    },
+
+    clearResources: {
+      request: {
+        resourceTypes: Arg(0, "array:string"),
+      },
+      oneway: true,
+    },
+
+    requestTypes: {
+      request: {},
+      response: RetVal("json"),
+    },
+  },
+
+  events: {
+    tabListChanged: {
+      type: "tabListChanged",
+    },
+    workerListChanged: {
+      type: "workerListChanged",
+    },
+    addonListChanged: {
+      type: "addonListChanged",
+    },
+    serviceWorkerRegistrationListChanged: {
+      type: "serviceWorkerRegistrationListChanged",
+    },
+    processListChanged: {
+      type: "processListChanged",
+    },
+
+    "resource-available-form": {
+      type: "resource-available-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-destroyed-form": {
+      type: "resource-destroyed-form",
+      resources: Arg(0, "array:json"),
+    },
+  },
+};
+
+const rootSpec = generateActorSpec(rootSpecPrototype);
+
+exports.rootSpecPrototype = rootSpecPrototype;
+exports.rootSpec = rootSpec;
diff --git a/devtools/shared/specs/screenshot-content.js b/devtools/shared/specs/screenshot-content.js
new file mode 100644
index 0000000000..c5205fe5a4
--- /dev/null
+++ b/devtools/shared/specs/screenshot-content.js
@@ -0,0 +1,34 @@
+/* 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";
+
+const {
+  RetVal,
+  Arg,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("screenshot-content.args", {
+  fullpage: "nullable:boolean",
+  selector: "nullable:string",
+  nodeActorID: "nullable:number",
+});
+
+const screenshotContentSpec = generateActorSpec({
+  typeName: "screenshot-content",
+
+  methods: {
+    prepareCapture: {
+      request: {
+        args: Arg(0, "screenshot-content.args"),
+      },
+      response: {
+        value: RetVal("json"),
+      },
+    },
+  },
+});
+
+exports.screenshotContentSpec = screenshotContentSpec;
diff --git a/devtools/shared/specs/screenshot.js b/devtools/shared/specs/screenshot.js
new file mode 100644
index 0000000000..3aa4a7035f
--- /dev/null
+++ b/devtools/shared/specs/screenshot.js
@@ -0,0 +1,37 @@
+/* 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";
+
+const {
+  RetVal,
+  Arg,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("screenshot.args", {
+  fullpage: "nullable:boolean",
+  file: "nullable:boolean",
+  clipboard: "nullable:boolean",
+  selector: "nullable:string",
+  dpr: "nullable:string",
+  delay: "nullable:string",
+});
+
+const screenshotSpec = generateActorSpec({
+  typeName: "screenshot",
+
+  methods: {
+    capture: {
+      request: {
+        args: Arg(0, "screenshot.args"),
+      },
+      response: {
+        value: RetVal("json"),
+      },
+    },
+  },
+});
+
+exports.screenshotSpec = screenshotSpec;
diff --git a/devtools/shared/specs/source.js b/devtools/shared/specs/source.js
new file mode 100644
index 0000000000..b2cd2d977a
--- /dev/null
+++ b/devtools/shared/specs/source.js
@@ -0,0 +1,87 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+const longstringType = types.getType("longstring");
+const arraybufferType = types.getType("arraybuffer");
+// The sourcedata type needs some custom marshalling, because it is sometimes
+// returned as an arraybuffer and sometimes as a longstring.
+types.addType("sourcedata", {
+  write: (value, context, detail) => {
+    if (value.typeName === "arraybuffer") {
+      return arraybufferType.write(value, context, detail);
+    }
+    return longstringType.write(value, context, detail);
+  },
+  read: (value, context, detail) => {
+    if (value.typeName === "arraybuffer") {
+      return arraybufferType.read(value, context, detail);
+    }
+    return longstringType.read(value, context, detail);
+  },
+});
+
+types.addDictType("sourceposition", {
+  line: "number",
+  column: "number",
+});
+types.addDictType("nullablesourceposition", {
+  line: "nullable:number",
+  column: "nullable:number",
+});
+types.addDictType("breakpointquery", {
+  start: "nullable:nullablesourceposition",
+  end: "nullable:nullablesourceposition",
+});
+
+types.addDictType("source.onsource", {
+  contentType: "nullable:string",
+  source: "nullable:sourcedata",
+});
+
+const sourceSpec = generateActorSpec({
+  typeName: "source",
+
+  methods: {
+    getBreakpointPositionsCompressed: {
+      request: {
+        query: Arg(0, "nullable:breakpointquery"),
+      },
+      response: {
+        positions: RetVal("json"),
+      },
+    },
+    getBreakableLines: {
+      request: {},
+      response: {
+        lines: RetVal("json"),
+      },
+    },
+    source: {
+      request: {},
+      response: RetVal("source.onsource"),
+    },
+    setPausePoints: {
+      request: {
+        pausePoints: Arg(0, "json"),
+      },
+    },
+    blackbox: {
+      request: { range: Arg(0, "nullable:json") },
+      response: { pausedInSource: RetVal("boolean") },
+    },
+    unblackbox: {
+      request: { range: Arg(0, "nullable:json") },
+    },
+  },
+});
+
+exports.sourceSpec = sourceSpec;
diff --git a/devtools/shared/specs/storage.js b/devtools/shared/specs/storage.js
new file mode 100644
index 0000000000..51ee69fd04
--- /dev/null
+++ b/devtools/shared/specs/storage.js
@@ -0,0 +1,308 @@
+/* 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";
+
+const protocol = require("resource://devtools/shared/protocol.js");
+const { Arg, RetVal, types } = protocol;
+
+const childSpecs = {};
+
+function createStorageSpec(options) {
+  // common methods for all storage types
+  const methods = {
+    getStoreObjects: {
+      request: {
+        host: Arg(0),
+        names: Arg(1, "nullable:array:string"),
+        options: Arg(2, "nullable:json"),
+      },
+      response: RetVal(options.storeObjectType),
+    },
+    getFields: {
+      request: {
+        subType: Arg(0, "nullable:string"),
+      },
+      response: {
+        value: RetVal("json"),
+      },
+    },
+  };
+
+  // extra methods specific for storage type
+  Object.assign(methods, options.methods);
+
+  childSpecs[options.typeName] = protocol.generateActorSpec({
+    typeName: options.typeName,
+    methods,
+    events: {
+      "single-store-update": {
+        type: "storesUpdate",
+        data: Arg(0, "storeUpdateObject"),
+      },
+      "single-store-cleared": {
+        type: "storesCleared",
+        data: Arg(0, "json"),
+      },
+    },
+  });
+}
+
+// Cookies store object
+types.addDictType("cookieobject", {
+  uniqueKey: "string",
+  name: "string",
+  value: "longstring",
+  path: "nullable:string",
+  host: "string",
+  hostOnly: "boolean",
+  isSecure: "boolean",
+  isHttpOnly: "boolean",
+  creationTime: "number",
+  lastAccessed: "number",
+  expires: "number",
+});
+
+// Array of cookie store objects
+types.addDictType("cookiestoreobject", {
+  total: "number",
+  offset: "number",
+  data: "array:nullable:cookieobject",
+});
+
+// Common methods for edit/remove
+const editRemoveMethods = {
+  getFields: {
+    request: {},
+    response: {
+      value: RetVal("json"),
+    },
+  },
+  editItem: {
+    request: {
+      data: Arg(0, "json"),
+    },
+    response: {},
+  },
+  removeItem: {
+    request: {
+      host: Arg(0, "string"),
+      name: Arg(1, "string"),
+    },
+    response: {},
+  },
+};
+
+// Cookies actor spec
+createStorageSpec({
+  typeName: "cookies",
+  storeObjectType: "cookiestoreobject",
+  methods: Object.assign(
+    {},
+    editRemoveMethods,
+    {
+      addItem: {
+        request: {
+          guid: Arg(0, "string"),
+          host: Arg(1, "nullable:string"),
+        },
+        response: {},
+      },
+    },
+    {
+      removeAll: {
+        request: {
+          host: Arg(0, "string"),
+          domain: Arg(1, "nullable:string"),
+        },
+        response: {},
+      },
+    },
+    {
+      removeAllSessionCookies: {
+        request: {
+          host: Arg(0, "string"),
+          domain: Arg(1, "nullable:string"),
+        },
+        response: {},
+      },
+    }
+  ),
+});
+
+// Local Storage / Session Storage store object
+types.addDictType("storageobject", {
+  name: "string",
+  value: "longstring",
+});
+
+// Common methods for local/session storage
+const storageMethods = Object.assign(
+  {},
+  editRemoveMethods,
+  {
+    addItem: {
+      request: {
+        guid: Arg(0, "string"),
+        host: Arg(1, "nullable:string"),
+      },
+      response: {},
+    },
+  },
+  {
+    removeAll: {
+      request: {
+        host: Arg(0, "string"),
+      },
+      response: {},
+    },
+  }
+);
+
+// Array of Local Storage / Session Storage store objects
+types.addDictType("storagestoreobject", {
+  total: "number",
+  offset: "number",
+  data: "array:nullable:storageobject",
+});
+
+createStorageSpec({
+  typeName: "localStorage",
+  storeObjectType: "storagestoreobject",
+  methods: storageMethods,
+});
+
+createStorageSpec({
+  typeName: "sessionStorage",
+  storeObjectType: "storagestoreobject",
+  methods: storageMethods,
+});
+
+types.addDictType("extensionobject", {
+  name: "nullable:string",
+  value: "nullable:longstring",
+  area: "string",
+  isValueEditable: "boolean",
+});
+
+types.addDictType("extensionstoreobject", {
+  total: "number",
+  offset: "number",
+  data: "array:nullable:extensionobject",
+});
+
+createStorageSpec({
+  typeName: "extensionStorage",
+  storeObjectType: "extensionstoreobject",
+  // Same as storageMethods except for addItem
+  methods: Object.assign({}, editRemoveMethods, {
+    removeAll: {
+      request: {
+        host: Arg(0, "string"),
+      },
+      response: {},
+    },
+  }),
+});
+
+types.addDictType("cacheobject", {
+  url: "string",
+  status: "string",
+});
+
+// Array of Cache store objects
+types.addDictType("cachestoreobject", {
+  total: "number",
+  offset: "number",
+  data: "array:nullable:cacheobject",
+});
+
+// Cache storage spec
+createStorageSpec({
+  typeName: "Cache",
+  storeObjectType: "cachestoreobject",
+  methods: {
+    removeAll: {
+      request: {
+        host: Arg(0, "string"),
+        name: Arg(1, "string"),
+      },
+      response: {},
+    },
+    removeItem: {
+      request: {
+        host: Arg(0, "string"),
+        name: Arg(1, "string"),
+      },
+      response: {},
+    },
+  },
+});
+
+// Indexed DB store object
+// This is a union on idb object, db metadata object and object store metadata
+// object
+types.addDictType("idbobject", {
+  uniqueKey: "string",
+  name: "nullable:string",
+  db: "nullable:string",
+  objectStore: "nullable:string",
+  origin: "nullable:string",
+  version: "nullable:number",
+  storage: "nullable:string",
+  objectStores: "nullable:number",
+  keyPath: "nullable:string",
+  autoIncrement: "nullable:boolean",
+  indexes: "nullable:string",
+  value: "nullable:longstring",
+});
+
+// Array of Indexed DB store objects
+types.addDictType("idbstoreobject", {
+  total: "number",
+  offset: "number",
+  data: "array:nullable:idbobject",
+});
+
+// Result of Indexed DB delete operation: can block or throw error
+types.addDictType("idbdeleteresult", {
+  blocked: "nullable:boolean",
+  error: "nullable:string",
+});
+
+createStorageSpec({
+  typeName: "indexedDB",
+  storeObjectType: "idbstoreobject",
+  methods: {
+    removeDatabase: {
+      request: {
+        host: Arg(0, "string"),
+        name: Arg(1, "string"),
+      },
+      response: RetVal("idbdeleteresult"),
+    },
+    removeAll: {
+      request: {
+        host: Arg(0, "string"),
+        name: Arg(1, "string"),
+      },
+      response: {},
+    },
+    removeItem: {
+      request: {
+        host: Arg(0, "string"),
+        name: Arg(1, "string"),
+      },
+      response: {},
+    },
+  },
+});
+
+// Update notification object
+types.addDictType("storeUpdateObject", {
+  changed: "nullable:json",
+  deleted: "nullable:json",
+  added: "nullable:json",
+});
+
+exports.childSpecs = childSpecs;
diff --git a/devtools/shared/specs/string.js b/devtools/shared/specs/string.js
new file mode 100644
index 0000000000..89b53c0a95
--- /dev/null
+++ b/devtools/shared/specs/string.js
@@ -0,0 +1,85 @@
+/* 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";
+
+const protocol = require("resource://devtools/shared/protocol.js");
+const { Arg, RetVal, generateActorSpec } = protocol;
+
+const longStringSpec = generateActorSpec({
+  typeName: "longstractor",
+
+  methods: {
+    substring: {
+      request: {
+        start: Arg(0),
+        end: Arg(1),
+      },
+      response: { substring: RetVal() },
+    },
+    release: { release: true },
+  },
+});
+
+exports.longStringSpec = longStringSpec;
+
+/**
+ * When a caller is expecting a LongString actor but the string is already available on
+ * client, the SimpleStringFront can be used as it shares the same API as a
+ * LongStringFront but will not make unnecessary trips to the server.
+ */
+class SimpleStringFront {
+  constructor(str) {
+    this.str = str;
+  }
+
+  get length() {
+    return this.str.length;
+  }
+
+  get initial() {
+    return this.str;
+  }
+
+  string() {
+    return Promise.resolve(this.str);
+  }
+
+  substring(start, end) {
+    return Promise.resolve(this.str.substring(start, end));
+  }
+
+  release() {
+    this.str = null;
+    return Promise.resolve(undefined);
+  }
+}
+
+exports.SimpleStringFront = SimpleStringFront;
+
+// The long string actor needs some custom marshalling, because it is sometimes
+// returned as a primitive rather than a complete form.
+
+var stringActorType = protocol.types.getType("longstractor");
+protocol.types.addType("longstring", {
+  _actor: true,
+  write: (value, context, detail) => {
+    if (!(context instanceof protocol.Actor)) {
+      throw Error("Passing a longstring as an argument isn't supported.");
+    }
+
+    if (value.short) {
+      return value.str;
+    }
+    return stringActorType.write(value, context, detail);
+  },
+  read: (value, context, detail) => {
+    if (context instanceof protocol.Actor) {
+      throw Error("Passing a longstring as an argument isn't supported.");
+    }
+    if (typeof value === "string") {
+      return new SimpleStringFront(value);
+    }
+    return stringActorType.read(value, context, detail);
+  },
+});
diff --git a/devtools/shared/specs/style-rule.js b/devtools/shared/specs/style-rule.js
new file mode 100644
index 0000000000..cb06a578b9
--- /dev/null
+++ b/devtools/shared/specs/style-rule.js
@@ -0,0 +1,73 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+// Load the shared types for style actors
+require("resource://devtools/shared/specs/style/style-types.js");
+
+types.addDictType("domstylerule.queryContainerForNodeReturn", {
+  node: "nullable:domnode",
+  containerType: "nullable:string",
+  blockSize: "nullable:string",
+  inlineSize: "nullable:string",
+});
+
+const styleRuleSpec = generateActorSpec({
+  typeName: "domstylerule",
+
+  events: {
+    "location-changed": {
+      type: "locationChanged",
+      line: Arg(0, "number"),
+      column: Arg(1, "number"),
+    },
+    "rule-updated": {
+      type: "ruleUpdated",
+      rule: Arg(0, "domstylerule"),
+    },
+  },
+
+  methods: {
+    getRuleText: {
+      response: {
+        text: RetVal("string"),
+      },
+    },
+    setRuleText: {
+      request: {
+        newText: Arg(0, "string"),
+        modifications: Arg(1, "array:json"),
+      },
+      response: { rule: RetVal("domstylerule") },
+    },
+    modifyProperties: {
+      request: { modifications: Arg(0, "array:json") },
+      response: { rule: RetVal("domstylerule") },
+    },
+    modifySelector: {
+      request: {
+        node: Arg(0, "domnode"),
+        value: Arg(1, "string"),
+        editAuthored: Arg(2, "boolean"),
+      },
+      response: RetVal("modifiedStylesReturn"),
+    },
+    getQueryContainerForNode: {
+      request: {
+        ancestorRuleIndex: Arg(0, "number"),
+        node: Arg(1, "domnode"),
+      },
+      response: RetVal("domstylerule.queryContainerForNodeReturn"),
+    },
+  },
+});
+
+exports.styleRuleSpec = styleRuleSpec;
diff --git a/devtools/shared/specs/style-sheets.js b/devtools/shared/specs/style-sheets.js
new file mode 100644
index 0000000000..94d3e72f5f
--- /dev/null
+++ b/devtools/shared/specs/style-sheets.js
@@ -0,0 +1,49 @@
+/* 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";
+
+const {
+  Arg,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const styleSheetsSpec = generateActorSpec({
+  typeName: "stylesheets",
+
+  events: {},
+
+  methods: {
+    getTraits: {
+      request: {},
+      response: { traits: RetVal("json") },
+    },
+    addStyleSheet: {
+      request: {
+        text: Arg(0, "string"),
+        fileName: Arg(1, "nullable:string"),
+      },
+      response: {},
+    },
+    toggleDisabled: {
+      request: { resourceId: Arg(0, "string") },
+      response: { disabled: RetVal("boolean") },
+    },
+    getText: {
+      request: { resourceId: Arg(0, "string") },
+      response: { text: RetVal("longstring") },
+    },
+    update: {
+      request: {
+        resourceId: Arg(0, "string"),
+        text: Arg(1, "string"),
+        transition: Arg(2, "boolean"),
+        cause: Arg(3, "nullable:string"),
+      },
+      response: {},
+    },
+  },
+});
+
+exports.styleSheetsSpec = styleSheetsSpec;
diff --git a/devtools/shared/specs/style/moz.build b/devtools/shared/specs/style/moz.build
new file mode 100644
index 0000000000..56883cc51a
--- /dev/null
+++ b/devtools/shared/specs/style/moz.build
@@ -0,0 +1,9 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+DevToolsModules(
+    "style-types.js",
+)
diff --git a/devtools/shared/specs/style/style-types.js b/devtools/shared/specs/style/style-types.js
new file mode 100644
index 0000000000..0a86353b4d
--- /dev/null
+++ b/devtools/shared/specs/style/style-types.js
@@ -0,0 +1,78 @@
+/* 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";
+
+const { RetVal, types } = require("resource://devtools/shared/protocol.js");
+
+// Predeclare the domstylerule actor type
+types.addActorType("domstylerule");
+
+/**
+ * When asking for the styles applied to a node, we return a list of
+ * appliedstyle json objects that lists the rules that apply to the node
+ * and which element they were inherited from (if any).
+ *
+ * Note appliedstyle only sends the list of actorIDs and is not a valid return
+ * value on its own. appliedstyle should be returned with the actual list of
+ * StyleRuleActor and StyleSheetActor. See appliedStylesReturn.
+ */
+types.addDictType("appliedstyle", {
+  rule: "domstylerule#actorid",
+  inherited: "nullable:domnode#actorid",
+  keyframes: "nullable:domstylerule#actorid",
+});
+
+types.addDictType("matchedselector", {
+  rule: "domstylerule#actorid",
+  selector: "string",
+  value: "string",
+  status: "number",
+});
+
+types.addDictType("appliedStylesReturn", {
+  entries: "array:appliedstyle",
+  rules: "array:domstylerule",
+});
+
+types.addDictType("modifiedStylesReturn", {
+  isMatching: RetVal("boolean"),
+  ruleProps: RetVal("nullable:appliedStylesReturn"),
+});
+
+types.addDictType("fontpreview", {
+  data: "nullable:longstring",
+  size: "json",
+});
+
+types.addDictType("fontvariationaxis", {
+  tag: "string",
+  name: "string",
+  minValue: "number",
+  maxValue: "number",
+  defaultValue: "number",
+});
+
+types.addDictType("fontvariationinstancevalue", {
+  axis: "string",
+  value: "number",
+});
+
+types.addDictType("fontvariationinstance", {
+  name: "string",
+  values: "array:fontvariationinstancevalue",
+});
+
+types.addDictType("fontface", {
+  name: "string",
+  CSSFamilyName: "string",
+  rule: "nullable:domstylerule",
+  srcIndex: "number",
+  URI: "string",
+  format: "string",
+  preview: "nullable:fontpreview",
+  localName: "string",
+  metadata: "string",
+  variationAxes: "array:fontvariationaxis",
+  variationInstances: "array:fontvariationinstance",
+});
diff --git a/devtools/shared/specs/symbol-iterator.js b/devtools/shared/specs/symbol-iterator.js
new file mode 100644
index 0000000000..c3345bcdd3
--- /dev/null
+++ b/devtools/shared/specs/symbol-iterator.js
@@ -0,0 +1,42 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Option,
+  RetVal,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("symboliterator.data", {
+  ownSymbols: "array:symboliterator.ownsymbols",
+});
+
+types.addDictType("symboliterator.ownsymbols", {
+  name: "string",
+  descriptor: "nullable:object.descriptor",
+});
+
+const symbolIteratorSpec = generateActorSpec({
+  typeName: "symbolIterator",
+
+  methods: {
+    slice: {
+      request: {
+        start: Option(0, "number"),
+        count: Option(0, "number"),
+      },
+      response: RetVal("symboliterator.data"),
+    },
+    all: {
+      request: {},
+      response: RetVal("symboliterator.data"),
+    },
+    release: { release: true },
+  },
+});
+
+exports.symbolIteratorSpec = symbolIteratorSpec;
diff --git a/devtools/shared/specs/symbol.js b/devtools/shared/specs/symbol.js
new file mode 100644
index 0000000000..77e44ce1e4
--- /dev/null
+++ b/devtools/shared/specs/symbol.js
@@ -0,0 +1,20 @@
+/* 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";
+
+const { generateActorSpec } = require("resource://devtools/shared/protocol.js");
+
+const symbolSpec = generateActorSpec({
+  typeName: "symbol",
+
+  methods: {
+    release: {
+      request: {},
+      response: {},
+    },
+  },
+});
+
+exports.symbolSpec = symbolSpec;
diff --git a/devtools/shared/specs/target-configuration.js b/devtools/shared/specs/target-configuration.js
new file mode 100644
index 0000000000..bfad03fe48
--- /dev/null
+++ b/devtools/shared/specs/target-configuration.js
@@ -0,0 +1,50 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  RetVal,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("target-configuration.configuration", {
+  cacheDisabled: "nullable:boolean",
+  colorSchemeSimulation: "nullable:string",
+  customFormatters: "nullable:boolean",
+  customUserAgent: "nullable:string",
+  javascriptEnabled: "nullable:boolean",
+  overrideDPPX: "nullable:number",
+  printSimulationEnabled: "nullable:boolean",
+  rdmPaneOrientation: "nullable:json",
+  reloadOnTouchSimulationToggle: "nullable:boolean",
+  restoreFocus: "nullable:boolean",
+  serviceWorkersTestingEnabled: "nullable:boolean",
+  touchEventsOverride: "nullable:string",
+});
+
+const targetConfigurationSpec = generateActorSpec({
+  typeName: "target-configuration",
+
+  methods: {
+    updateConfiguration: {
+      request: {
+        configuration: Arg(0, "target-configuration.configuration"),
+      },
+      response: {
+        configuration: RetVal("target-configuration.configuration"),
+      },
+    },
+    isJavascriptEnabled: {
+      request: {},
+      response: {
+        javascriptEnabled: RetVal("boolean"),
+      },
+    },
+  },
+});
+
+exports.targetConfigurationSpec = targetConfigurationSpec;
diff --git a/devtools/shared/specs/targets/content-process.js b/devtools/shared/specs/targets/content-process.js
new file mode 100644
index 0000000000..3c7edef4a2
--- /dev/null
+++ b/devtools/shared/specs/targets/content-process.js
@@ -0,0 +1,55 @@
+/* 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";
+
+const {
+  types,
+  Arg,
+  Option,
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("contentProcessTarget.workers", {
+  error: "nullable:string",
+  workers: "nullable:array:workerDescriptor",
+});
+
+const contentProcessTargetSpec = generateActorSpec({
+  typeName: "contentProcessTarget",
+
+  methods: {
+    listWorkers: {
+      request: {},
+      response: RetVal("contentProcessTarget.workers"),
+    },
+
+    pauseMatchingServiceWorkers: {
+      request: {
+        origin: Option(0, "string"),
+      },
+      response: {},
+    },
+  },
+
+  events: {
+    workerListChanged: {
+      type: "workerListChanged",
+    },
+    "resource-available-form": {
+      type: "resource-available-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-destroyed-form": {
+      type: "resource-destroyed-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-updated-form": {
+      type: "resource-updated-form",
+      resources: Arg(0, "array:json"),
+    },
+  },
+});
+
+exports.contentProcessTargetSpec = contentProcessTargetSpec;
diff --git a/devtools/shared/specs/targets/moz.build b/devtools/shared/specs/targets/moz.build
new file mode 100644
index 0000000000..9c22a1a241
--- /dev/null
+++ b/devtools/shared/specs/targets/moz.build
@@ -0,0 +1,13 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+DevToolsModules(
+    "content-process.js",
+    "parent-process.js",
+    "webextension.js",
+    "window-global.js",
+    "worker.js",
+)
diff --git a/devtools/shared/specs/targets/parent-process.js b/devtools/shared/specs/targets/parent-process.js
new file mode 100644
index 0000000000..dca2c777fa
--- /dev/null
+++ b/devtools/shared/specs/targets/parent-process.js
@@ -0,0 +1,24 @@
+/* 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";
+
+const { generateActorSpec } = require("resource://devtools/shared/protocol.js");
+const { extend } = require("resource://devtools/shared/extend.js");
+const {
+  windowGlobalTargetSpecPrototype,
+} = require("resource://devtools/shared/specs/targets/window-global.js");
+
+const parentProcessTargetSpecPrototype = extend(
+  windowGlobalTargetSpecPrototype,
+  {
+    typeName: "parentProcessTarget",
+  }
+);
+
+const parentProcessTargetSpec = generateActorSpec(
+  parentProcessTargetSpecPrototype
+);
+
+exports.parentProcessTargetSpecPrototype = parentProcessTargetSpecPrototype;
+exports.parentProcessTargetSpec = parentProcessTargetSpec;
diff --git a/devtools/shared/specs/targets/webextension.js b/devtools/shared/specs/targets/webextension.js
new file mode 100644
index 0000000000..4eeffb3da7
--- /dev/null
+++ b/devtools/shared/specs/targets/webextension.js
@@ -0,0 +1,18 @@
+/* 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";
+
+const { generateActorSpec } = require("resource://devtools/shared/protocol.js");
+const { extend } = require("resource://devtools/shared/extend.js");
+const {
+  parentProcessTargetSpecPrototype,
+} = require("resource://devtools/shared/specs/targets/parent-process.js");
+
+const webExtensionTargetSpec = generateActorSpec(
+  extend(parentProcessTargetSpecPrototype, {
+    typeName: "webExtensionTarget",
+  })
+);
+
+exports.webExtensionTargetSpec = webExtensionTargetSpec;
diff --git a/devtools/shared/specs/targets/window-global.js b/devtools/shared/specs/targets/window-global.js
new file mode 100644
index 0000000000..597e0eb0e8
--- /dev/null
+++ b/devtools/shared/specs/targets/window-global.js
@@ -0,0 +1,156 @@
+/* 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";
+
+const {
+  types,
+  generateActorSpec,
+  RetVal,
+  Option,
+  Arg,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("windowGlobalTarget.switchtoframe", {
+  message: "string",
+});
+
+types.addDictType("windowGlobalTarget.listframes", {
+  frames: "array:windowGlobalTarget.window",
+});
+
+types.addDictType("windowGlobalTarget.window", {
+  id: "string",
+  parentID: "nullable:string",
+  url: "nullable:string", // should be present if not destroying
+  title: "nullable:string", // should be present if not destroying
+  destroy: "nullable:boolean", // not present if not destroying
+});
+
+types.addDictType("windowGlobalTarget.workers", {
+  workers: "array:workerDescriptor",
+});
+
+// @backward-compat { legacy }
+//                  reload is preserved for third party tools. See Bug 1717837.
+//                  DevTools should use Descriptor::reloadDescriptor instead.
+types.addDictType("windowGlobalTarget.reload", {
+  force: "boolean",
+});
+
+// @backward-compat { version 87 } See backward-compat note for `reconfigure`.
+types.addDictType("windowGlobalTarget.reconfigure", {
+  cacheDisabled: "nullable:boolean",
+  colorSchemeSimulation: "nullable:string",
+  printSimulationEnabled: "nullable:boolean",
+  restoreFocus: "nullable:boolean",
+  serviceWorkersTestingEnabled: "nullable:boolean",
+});
+
+const windowGlobalTargetSpecPrototype = {
+  typeName: "windowGlobalTarget",
+
+  methods: {
+    detach: {
+      request: {},
+      response: {},
+    },
+    focus: {
+      request: {},
+      response: {},
+    },
+    goForward: {
+      request: {},
+      response: {},
+    },
+    goBack: {
+      request: {},
+      response: {},
+    },
+    // @backward-compat { legacy }
+    //                  reload is preserved for third party tools. See Bug 1717837.
+    //                  DevTools should use Descriptor::reloadDescriptor instead.
+    reload: {
+      request: {
+        options: Option(0, "windowGlobalTarget.reload"),
+      },
+      response: {},
+    },
+    navigateTo: {
+      request: {
+        url: Option(0, "string"),
+      },
+      response: {},
+    },
+    // @backward-compat { version 87 } Starting with version 87, targets which
+    // support the watcher will rely on the configuration actor to update their
+    // configuration flags. However we need to keep this request until all
+    // browsing context targets support the watcher (eg webextensions).
+    reconfigure: {
+      request: {
+        options: Option(0, "windowGlobalTarget.reconfigure"),
+      },
+      response: {},
+    },
+    switchToFrame: {
+      request: {
+        windowId: Option(0, "string"),
+      },
+      response: RetVal("windowGlobalTarget.switchtoframe"),
+    },
+    listFrames: {
+      request: {},
+      response: RetVal("windowGlobalTarget.listframes"),
+    },
+    listWorkers: {
+      request: {},
+      response: RetVal("windowGlobalTarget.workers"),
+    },
+    logInPage: {
+      request: {
+        text: Option(0, "string"),
+        category: Option(0, "string"),
+        flags: Option(0, "string"),
+      },
+      response: {},
+    },
+  },
+  events: {
+    tabNavigated: {
+      type: "tabNavigated",
+      url: Option(0, "string"),
+      title: Option(0, "string"),
+      state: Option(0, "string"),
+      isFrameSwitching: Option(0, "boolean"),
+    },
+    frameUpdate: {
+      type: "frameUpdate",
+      frames: Option(0, "nullable:array:windowGlobalTarget.window"),
+      selected: Option(0, "nullable:number"),
+      destroyAll: Option(0, "nullable:boolean"),
+    },
+    workerListChanged: {
+      type: "workerListChanged",
+    },
+
+    "resource-available-form": {
+      type: "resource-available-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-destroyed-form": {
+      type: "resource-destroyed-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-updated-form": {
+      type: "resource-updated-form",
+      resources: Arg(0, "array:json"),
+    },
+  },
+};
+
+const windowGlobalTargetSpec = generateActorSpec(
+  windowGlobalTargetSpecPrototype
+);
+
+exports.windowGlobalTargetSpecPrototype = windowGlobalTargetSpecPrototype;
+exports.windowGlobalTargetSpec = windowGlobalTargetSpec;
diff --git a/devtools/shared/specs/targets/worker.js b/devtools/shared/specs/targets/worker.js
new file mode 100644
index 0000000000..d329f5b9dd
--- /dev/null
+++ b/devtools/shared/specs/targets/worker.js
@@ -0,0 +1,30 @@
+/* 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";
+
+const {
+  Arg,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const workerTargetSpec = generateActorSpec({
+  typeName: "workerTarget",
+  methods: {},
+  events: {
+    "resource-available-form": {
+      type: "resource-available-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-destroyed-form": {
+      type: "resource-destroyed-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-updated-form": {
+      type: "resource-updated-form",
+      resources: Arg(0, "array:json"),
+    },
+  },
+});
+
+exports.workerTargetSpec = workerTargetSpec;
diff --git a/devtools/shared/specs/thread-configuration.js b/devtools/shared/specs/thread-configuration.js
new file mode 100644
index 0000000000..6d412097fe
--- /dev/null
+++ b/devtools/shared/specs/thread-configuration.js
@@ -0,0 +1,31 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("thread-configuration.configuration", {
+  pauseOnExceptions: "nullable:boolean",
+  ignoreCaughtExceptions: "nullable:boolean",
+});
+
+const threadConfigurationSpec = generateActorSpec({
+  typeName: "thread-configuration",
+
+  methods: {
+    updateConfiguration: {
+      request: {
+        configuration: Arg(0, "thread-configuration.configuration"),
+      },
+      response: {},
+    },
+  },
+});
+
+exports.threadConfigurationSpec = threadConfigurationSpec;
diff --git a/devtools/shared/specs/thread.js b/devtools/shared/specs/thread.js
new file mode 100644
index 0000000000..1a4f862fb1
--- /dev/null
+++ b/devtools/shared/specs/thread.js
@@ -0,0 +1,189 @@
+/* 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";
+
+const {
+  Arg,
+  Option,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("available-breakpoint-group", {
+  name: "string",
+  events: "array:available-breakpoint-event",
+});
+
+types.addDictType("available-breakpoint-event", {
+  id: "string",
+  name: "string",
+});
+
+types.addDictType("thread.frames", {
+  frames: "array:frame",
+});
+
+types.addDictType("thread.breakpoint-options", {
+  condition: "nullable:string",
+  logValue: "nullable:string",
+});
+
+types.addDictType("paused-reason", {
+  type: "string",
+
+  // Used for any pause type that wants to describe why the pause happened.
+  message: "nullable:string",
+
+  // Used for the stepping pause types.
+  frameFinished: "nullable:json",
+
+  // Used for the "exception" pause type.
+  exception: "nullable:json",
+
+  // Used for the "interrupted" pause type.
+  onNext: "nullable:boolean",
+
+  // Used for the "eventBreakpoint" pause type.
+  breakpoint: "nullable:json",
+
+  // Used for the "mutationBreakpoint" pause type.
+  mutationType: "nullable:string",
+});
+
+const threadSpec = generateActorSpec({
+  typeName: "thread",
+
+  events: {
+    paused: {
+      actor: Option(0, "nullable:string"),
+      frame: Option(0, "frame"),
+      why: Option(0, "paused-reason"),
+    },
+    resumed: {},
+    newSource: {
+      source: Option(0, "json"),
+    },
+  },
+
+  methods: {
+    attach: {
+      request: {
+        options: Arg(0, "json"),
+      },
+      response: {},
+    },
+    reconfigure: {
+      request: {
+        options: Arg(0, "json"),
+      },
+      response: {},
+    },
+    resume: {
+      request: {
+        resumeLimit: Arg(0, "nullable:json"),
+        frameActorID: Arg(1, "nullable:string"),
+      },
+      response: RetVal("nullable:json"),
+    },
+    frames: {
+      request: {
+        start: Arg(0, "number"),
+        count: Arg(1, "number"),
+      },
+      response: RetVal("thread.frames"),
+    },
+    interrupt: {
+      request: {
+        when: Arg(0, "json"),
+      },
+    },
+    sources: {
+      response: {
+        sources: RetVal("array:json"),
+      },
+    },
+    skipBreakpoints: {
+      request: {
+        skip: Arg(0, "json"),
+      },
+      response: {
+        skip: Arg(0, "json"),
+      },
+    },
+    dumpThread: {
+      request: {},
+      response: RetVal("json"),
+    },
+    dumpPools: {
+      request: {},
+      response: RetVal("json"),
+    },
+    setBreakpoint: {
+      request: {
+        location: Arg(0, "json"),
+        options: Arg(1, "thread.breakpoint-options"),
+      },
+    },
+    removeBreakpoint: {
+      request: {
+        location: Arg(0, "json"),
+      },
+    },
+    setXHRBreakpoint: {
+      request: {
+        path: Arg(0, "string"),
+        method: Arg(1, "string"),
+      },
+      response: {
+        value: RetVal("boolean"),
+      },
+    },
+    removeXHRBreakpoint: {
+      request: {
+        path: Arg(0, "string"),
+        method: Arg(1, "string"),
+      },
+      response: {
+        value: RetVal("boolean"),
+      },
+    },
+    getAvailableEventBreakpoints: {
+      response: {
+        value: RetVal("array:available-breakpoint-group"),
+      },
+    },
+    getActiveEventBreakpoints: {
+      response: {
+        ids: RetVal("array:string"),
+      },
+    },
+    setActiveEventBreakpoints: {
+      request: {
+        ids: Arg(0, "array:string"),
+      },
+    },
+    pauseOnExceptions: {
+      request: {
+        pauseOnExceptions: Arg(0, "string"),
+        ignoreCaughtExceptions: Arg(1, "string"),
+      },
+    },
+
+    toggleEventLogging: {
+      request: {
+        logEventBreakpoints: Arg(0, "string"),
+      },
+    },
+
+    isAttached: {
+      request: {},
+      response: {
+        value: RetVal("boolean"),
+      },
+    },
+  },
+});
+
+exports.threadSpec = threadSpec;
diff --git a/devtools/shared/specs/tracer.js b/devtools/shared/specs/tracer.js
new file mode 100644
index 0000000000..78ac609457
--- /dev/null
+++ b/devtools/shared/specs/tracer.js
@@ -0,0 +1,27 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+} = require("resource://devtools/shared/protocol.js");
+
+const tracerSpec = generateActorSpec({
+  typeName: "tracer",
+
+  methods: {
+    startTracing: {
+      request: {
+        logMethod: Arg(0, "string"),
+      },
+    },
+    stopTracing: {
+      request: {},
+    },
+  },
+});
+
+exports.tracerSpec = tracerSpec;
diff --git a/devtools/shared/specs/walker.js b/devtools/shared/specs/walker.js
new file mode 100644
index 0000000000..b66311b720
--- /dev/null
+++ b/devtools/shared/specs/walker.js
@@ -0,0 +1,389 @@
+/* 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";
+
+const {
+  Arg,
+  Option,
+  RetVal,
+  generateActorSpec,
+  types,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("dommutation", {});
+
+types.addDictType("searchresult", {
+  list: "domnodelist",
+  // Right now there is isn't anything required for metadata,
+  // but it's json so it can be extended with extra data.
+  metadata: "array:json",
+});
+
+// Some common request/response templates for the dom walker
+
+var nodeArrayMethod = {
+  request: {
+    node: Arg(0, "domnode"),
+    maxNodes: Option(1),
+    center: Option(1, "domnode"),
+    start: Option(1, "domnode"),
+  },
+  response: RetVal(
+    types.addDictType("domtraversalarray", {
+      nodes: "array:domnode",
+    })
+  ),
+};
+
+var traversalMethod = {
+  request: {
+    node: Arg(0, "domnode"),
+  },
+  response: {
+    node: RetVal("nullable:domnode"),
+  },
+};
+
+const walkerSpec = generateActorSpec({
+  typeName: "domwalker",
+
+  events: {
+    "new-mutations": {
+      type: "newMutations",
+    },
+    "root-available": {
+      type: "root-available",
+      node: Arg(0, "nullable:domnode"),
+    },
+    "root-destroyed": {
+      type: "root-destroyed",
+      node: Arg(0, "nullable:domnode"),
+    },
+    "picker-node-picked": {
+      type: "pickerNodePicked",
+      node: Arg(0, "disconnectedNode"),
+    },
+    "picker-node-previewed": {
+      type: "pickerNodePreviewed",
+      node: Arg(0, "disconnectedNode"),
+    },
+    "picker-node-hovered": {
+      type: "pickerNodeHovered",
+      node: Arg(0, "disconnectedNode"),
+    },
+    "picker-node-canceled": {
+      type: "pickerNodeCanceled",
+    },
+    "display-change": {
+      type: "display-change",
+      nodes: Arg(0, "array:domnode"),
+    },
+    "scrollable-change": {
+      type: "scrollable-change",
+      nodes: Arg(0, "array:domnode"),
+    },
+    "overflow-change": {
+      type: "overflow-change",
+      nodes: Arg(0, "array:domnode"),
+    },
+    // The walker actor emits a useful "resize" event to its front to let
+    // clients know when the browser window gets resized. This may be useful
+    // for refreshing a DOM node's styles for example, since those may depend on
+    // media-queries.
+    resize: {
+      type: "resize",
+    },
+  },
+
+  methods: {
+    release: {
+      release: true,
+    },
+    document: {
+      request: { node: Arg(0, "nullable:domnode") },
+      response: { node: RetVal("domnode") },
+    },
+    documentElement: {
+      request: { node: Arg(0, "nullable:domnode") },
+      response: { node: RetVal("domnode") },
+    },
+    retainNode: {
+      request: { node: Arg(0, "domnode") },
+      response: {},
+    },
+    unretainNode: {
+      request: { node: Arg(0, "domnode") },
+      response: {},
+    },
+    releaseNode: {
+      request: {
+        node: Arg(0, "domnode"),
+        force: Option(1),
+      },
+    },
+    children: nodeArrayMethod,
+    nextSibling: traversalMethod,
+    previousSibling: traversalMethod,
+    findInspectingNode: {
+      request: {},
+      response: RetVal("disconnectedNode"),
+    },
+    querySelector: {
+      request: {
+        node: Arg(0, "domnode"),
+        selector: Arg(1),
+      },
+      response: RetVal("disconnectedNode"),
+    },
+    querySelectorAll: {
+      request: {
+        node: Arg(0, "domnode"),
+        selector: Arg(1),
+      },
+      response: {
+        list: RetVal("domnodelist"),
+      },
+    },
+    search: {
+      request: {
+        query: Arg(0),
+      },
+      response: {
+        list: RetVal("searchresult"),
+      },
+    },
+    getSuggestionsForQuery: {
+      request: {
+        query: Arg(0),
+        completing: Arg(1),
+        selectorState: Arg(2),
+      },
+      response: {
+        list: RetVal("array:array:string"),
+      },
+    },
+    addPseudoClassLock: {
+      request: {
+        node: Arg(0, "domnode"),
+        pseudoClass: Arg(1),
+        parents: Option(2),
+        enabled: Option(2, "boolean"),
+      },
+      response: {},
+    },
+    hideNode: {
+      request: { node: Arg(0, "domnode") },
+    },
+    unhideNode: {
+      request: { node: Arg(0, "domnode") },
+    },
+    removePseudoClassLock: {
+      request: {
+        node: Arg(0, "domnode"),
+        pseudoClass: Arg(1),
+        parents: Option(2),
+      },
+      response: {},
+    },
+    clearPseudoClassLocks: {
+      request: {
+        node: Arg(0, "nullable:domnode"),
+      },
+      response: {},
+    },
+    innerHTML: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {
+        value: RetVal("longstring"),
+      },
+    },
+    setInnerHTML: {
+      request: {
+        node: Arg(0, "domnode"),
+        value: Arg(1, "string"),
+      },
+      response: {},
+    },
+    outerHTML: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {
+        value: RetVal("longstring"),
+      },
+    },
+    setOuterHTML: {
+      request: {
+        node: Arg(0, "domnode"),
+        value: Arg(1, "string"),
+      },
+      response: {},
+    },
+    insertAdjacentHTML: {
+      request: {
+        node: Arg(0, "domnode"),
+        position: Arg(1, "string"),
+        value: Arg(2, "string"),
+      },
+      response: RetVal("disconnectedNodeArray"),
+    },
+    duplicateNode: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {},
+    },
+    removeNode: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {
+        nextSibling: RetVal("nullable:domnode"),
+      },
+    },
+    removeNodes: {
+      request: {
+        node: Arg(0, "array:domnode"),
+      },
+      response: {},
+    },
+    insertBefore: {
+      request: {
+        node: Arg(0, "domnode"),
+        parent: Arg(1, "domnode"),
+        sibling: Arg(2, "nullable:domnode"),
+      },
+      response: {},
+    },
+    editTagName: {
+      request: {
+        node: Arg(0, "domnode"),
+        tagName: Arg(1, "string"),
+      },
+      response: {},
+    },
+    getMutations: {
+      request: {
+        cleanup: Option(0),
+      },
+      response: {
+        mutations: RetVal("array:dommutation"),
+      },
+    },
+    isInDOMTree: {
+      request: { node: Arg(0, "domnode") },
+      response: { attached: RetVal("boolean") },
+    },
+    getNodeActorFromWindowID: {
+      request: {
+        windowID: Arg(0, "string"),
+      },
+      response: {
+        nodeFront: RetVal("nullable:disconnectedNode"),
+      },
+    },
+    getNodeActorFromContentDomReference: {
+      request: {
+        contentDomReference: Arg(0, "json"),
+      },
+      response: {
+        nodeFront: RetVal("nullable:disconnectedNode"),
+      },
+    },
+    getStyleSheetOwnerNode: {
+      request: {
+        styleSheetActorID: Arg(0, "string"),
+      },
+      response: {
+        ownerNode: RetVal("nullable:disconnectedNode"),
+      },
+    },
+    getNodeFromActor: {
+      request: {
+        actorID: Arg(0, "string"),
+        path: Arg(1, "array:string"),
+      },
+      response: {
+        node: RetVal("nullable:disconnectedNode"),
+      },
+    },
+    getLayoutInspector: {
+      request: {},
+      response: {
+        actor: RetVal("layout"),
+      },
+    },
+    getParentGridNode: {
+      request: {
+        node: Arg(0, "nullable:domnode"),
+      },
+      response: {
+        node: RetVal("nullable:domnode"),
+      },
+    },
+    getOffsetParent: {
+      request: {
+        node: Arg(0, "nullable:domnode"),
+      },
+      response: {
+        node: RetVal("nullable:domnode"),
+      },
+    },
+    setMutationBreakpoints: {
+      request: {
+        node: Arg(0, "nullable:domnode"),
+        subtree: Option(1, "nullable:boolean"),
+        removal: Option(1, "nullable:boolean"),
+        attribute: Option(1, "nullable:boolean"),
+      },
+      response: {},
+    },
+    getEmbedderElement: {
+      request: {
+        browsingContextID: Arg(0, "string"),
+      },
+      response: {
+        nodeFront: RetVal("disconnectedNode"),
+      },
+    },
+    pick: {
+      request: {
+        doFocus: Arg(0, "nullable:boolean"),
+        isLocalTab: Arg(1, "nullable:boolean"),
+      },
+    },
+    cancelPick: {
+      request: {},
+      response: {},
+    },
+    clearPicker: {
+      request: {},
+      oneway: true,
+    },
+    watchRootNode: {
+      request: {},
+      response: {},
+    },
+    getOverflowCausingElements: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {
+        list: RetVal("disconnectedNodeArray"),
+      },
+    },
+    getScrollableAncestorNode: {
+      request: {
+        node: Arg(0, "domnode"),
+      },
+      response: {
+        node: RetVal("nullable:domnode"),
+      },
+    },
+  },
+});
+
+exports.walkerSpec = walkerSpec;
diff --git a/devtools/shared/specs/watcher.js b/devtools/shared/specs/watcher.js
new file mode 100644
index 0000000000..9ba19900eb
--- /dev/null
+++ b/devtools/shared/specs/watcher.js
@@ -0,0 +1,123 @@
+/* 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";
+
+const {
+  generateActorSpec,
+  Arg,
+  RetVal,
+} = require("resource://devtools/shared/protocol.js");
+
+const watcherSpecPrototype = {
+  typeName: "watcher",
+
+  methods: {
+    watchTargets: {
+      request: {
+        targetType: Arg(0, "string"),
+      },
+      response: {},
+    },
+
+    unwatchTargets: {
+      request: {
+        targetType: Arg(0, "string"),
+        options: Arg(1, "nullable:json"),
+      },
+      oneway: true,
+    },
+
+    getParentBrowsingContextID: {
+      request: {
+        browsingContextID: Arg(0, "number"),
+      },
+      response: {
+        browsingContextID: RetVal("nullable:number"),
+      },
+    },
+
+    watchResources: {
+      request: {
+        resourceTypes: Arg(0, "array:string"),
+      },
+      response: {},
+    },
+
+    unwatchResources: {
+      request: {
+        resourceTypes: Arg(0, "array:string"),
+      },
+      oneway: true,
+    },
+
+    clearResources: {
+      request: {
+        resourceTypes: Arg(0, "array:string"),
+      },
+      oneway: true,
+    },
+
+    getNetworkParentActor: {
+      request: {},
+      response: {
+        network: RetVal("networkParent"),
+      },
+    },
+
+    getBlackboxingActor: {
+      request: {},
+      response: {
+        blackboxing: RetVal("blackboxing"),
+      },
+    },
+
+    getBreakpointListActor: {
+      request: {},
+      response: {
+        breakpointList: RetVal("breakpoint-list"),
+      },
+    },
+
+    getTargetConfigurationActor: {
+      request: {},
+      response: {
+        configuration: RetVal("target-configuration"),
+      },
+    },
+
+    getThreadConfigurationActor: {
+      request: {},
+      response: {
+        configuration: RetVal("thread-configuration"),
+      },
+    },
+  },
+
+  events: {
+    "target-available-form": {
+      type: "target-available-form",
+      target: Arg(0, "json"),
+    },
+    "target-destroyed-form": {
+      type: "target-destroyed-form",
+      target: Arg(0, "json"),
+      options: Arg(1, "nullable:json"),
+    },
+
+    "resource-available-form": {
+      type: "resource-available-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-destroyed-form": {
+      type: "resource-destroyed-form",
+      resources: Arg(0, "array:json"),
+    },
+    "resource-updated-form": {
+      type: "resource-updated-form",
+      resources: Arg(0, "array:json"),
+    },
+  },
+};
+
+exports.watcherSpec = generateActorSpec(watcherSpecPrototype);
diff --git a/devtools/shared/specs/webconsole.js b/devtools/shared/specs/webconsole.js
new file mode 100644
index 0000000000..c861fd793a
--- /dev/null
+++ b/devtools/shared/specs/webconsole.js
@@ -0,0 +1,201 @@
+/* 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";
+
+const {
+  types,
+  generateActorSpec,
+  RetVal,
+  Option,
+  Arg,
+} = require("resource://devtools/shared/protocol.js");
+
+types.addDictType("console.startlisteners", {
+  startedListeners: "array:string",
+});
+
+types.addDictType("console.stoplisteners", {
+  stoppedListeners: "array:string",
+});
+
+types.addDictType("console.autocomplete", {
+  matches: "array:string",
+  matchProp: "string",
+});
+
+types.addDictType("console.evaluatejsasync", {
+  resultID: "string",
+});
+
+types.addDictType("console.cachedmessages", {
+  // this type is a union of two potential return types:
+  // { error, message } and { _type, message, timeStamp }
+  error: "nullable:string",
+  message: "longstring",
+  _type: "nullable:string",
+  timeStamp: "nullable:string",
+});
+
+const webconsoleSpecPrototype = {
+  typeName: "console",
+
+  events: {
+    evaluationResult: {
+      resultID: Option(0, "string"),
+      awaitResult: Option(0, "nullable:boolean"),
+      errorMessageName: Option(0, "nullable:string"),
+      exception: Option(0, "nullable:json"),
+      exceptionMessage: Option(0, "nullable:string"),
+      exceptionDocURL: Option(0, "nullable:string"),
+      exceptionStack: Option(0, "nullable:json"),
+      hasException: Option(0, "nullable:boolean"),
+      frame: Option(0, "nullable:json"),
+      helperResult: Option(0, "nullable:json"),
+      input: Option(0, "nullable:string"),
+      notes: Option(0, "nullable:string"),
+      result: Option(0, "nullable:json"),
+      startTime: Option(0, "number"),
+      timestamp: Option(0, "number"),
+      topLevelAwaitRejected: Option(0, "nullable:boolean"),
+    },
+    fileActivity: {
+      uri: Option(0, "string"),
+    },
+    pageError: {
+      pageError: Option(0, "json"),
+    },
+    logMessage: {
+      message: Option(0, "json"),
+      timeStamp: Option(0, "string"),
+    },
+    consoleAPICall: {
+      message: Option(0, "json"),
+      clonedFromContentProcess: Option(0, "nullable:boolean"),
+    },
+    reflowActivity: {
+      interruptible: Option(0, "boolean"),
+      start: Option(0, "number"),
+      end: Option(0, "number"),
+      sourceURL: Option(0, "nullable:string"),
+      sourceLine: Option(0, "nullable:number"),
+      functionName: Option(0, "nullable:string"),
+    },
+    // This event is modified re-emitted on the client as "networkEvent".
+    // In order to avoid a naming collision, we rename the server event.
+    serverNetworkEvent: {
+      type: "networkEvent",
+      eventActor: Option(0, "json"),
+    },
+    inspectObject: {
+      objectActor: Option(0, "json"),
+    },
+    documentEvent: {
+      name: Option(0, "string"),
+      time: Option(0, "string"),
+      hasNativeConsoleAPI: Option(0, "boolean"),
+    },
+  },
+
+  methods: {
+    /**
+     * Start the given Web Console listeners.
+     *
+     * @see webconsoleFront LISTENERS
+     * @Arg array events
+     *        Array of events you want to start. See this.LISTENERS for
+     *        known events.
+     */
+    startListeners: {
+      request: {
+        listeners: Arg(0, "array:string"),
+      },
+      response: RetVal("console.startlisteners"),
+    },
+    /**
+     * Stop the given Web Console listeners.
+     *
+     * @see webconsoleFront LISTENERS
+     * @Arg array events
+     *        Array of events you want to stop. See this.LISTENERS for
+     *        known events.
+     * @Arg function onResponse
+     *        Function to invoke when the server response is received.
+     */
+    stopListeners: {
+      request: {
+        listeners: Arg(0, "nullable:array:string"),
+      },
+      response: RetVal("console.stoplisteners"),
+    },
+    /**
+     * Retrieve the cached messages from the server.
+     *
+     * @see webconsoleFront CACHED_MESSAGES
+     * @Arg array types
+     *        The array of message types you want from the server. See
+     *        this.CACHED_MESSAGES for known types.
+     */
+    getCachedMessages: {
+      request: {
+        messageTypes: Arg(0, "array:string"),
+      },
+      // the return value here has a field "string" which can either be a longStringActor
+      // or a plain string. Since we do not have union types, we cannot fully type this
+      // response
+      response: RetVal("console.cachedmessages"),
+    },
+    evaluateJSAsync: {
+      request: {
+        text: Option(0, "string"),
+        frameActor: Option(0, "string"),
+        url: Option(0, "string"),
+        selectedNodeActor: Option(0, "string"),
+        selectedObjectActor: Option(0, "string"),
+        innerWindowID: Option(0, "number"),
+        mapped: Option(0, "nullable:json"),
+        eager: Option(0, "nullable:boolean"),
+      },
+      response: RetVal("console.evaluatejsasync"),
+    },
+    /**
+     * Autocomplete a JavaScript expression.
+     *
+     * @Arg {String} string
+     *      The code you want to autocomplete.
+     * @Arg {Number} cursor
+     *      Cursor location inside the string. Index starts from 0.
+     * @Arg {String} frameActor
+     *      The id of the frame actor that made the call.
+     * @Arg {String} selectedNodeActor: Actor id of the selected node in the inspector.
+     * @Arg {Array} authorizedEvaluations
+     *      Array of the properties access which can be executed by the engine.
+     *      Example: [["x", "myGetter"], ["x", "myGetter", "y", "anotherGetter"]] to
+     *      retrieve properties of `x.myGetter.` and `x.myGetter.y.anotherGetter`.
+     */
+    autocomplete: {
+      request: {
+        text: Arg(0, "string"),
+        cursor: Arg(1, "nullable:number"),
+        frameActor: Arg(2, "nullable:string"),
+        selectedNodeActor: Arg(3, "nullable:string"),
+        authorizedEvaluations: Arg(4, "nullable:json"),
+        expressionVars: Arg(5, "nullable:json"),
+      },
+      response: RetVal("console.autocomplete"),
+    },
+
+    /**
+     * Same as clearMessagesCache, but wait for the server response.
+     */
+    clearMessagesCacheAsync: {
+      request: {},
+    },
+  },
+};
+
+const webconsoleSpec = generateActorSpec(webconsoleSpecPrototype);
+
+exports.webconsoleSpecPrototype = webconsoleSpecPrototype;
+exports.webconsoleSpec = webconsoleSpec;
diff --git a/devtools/shared/specs/worker/moz.build b/devtools/shared/specs/worker/moz.build
new file mode 100644
index 0000000000..dae0e2d606
--- /dev/null
+++ b/devtools/shared/specs/worker/moz.build
@@ -0,0 +1,11 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+DevToolsModules(
+    "push-subscription.js",
+    "service-worker-registration.js",
+    "service-worker.js",
+)
diff --git a/devtools/shared/specs/worker/push-subscription.js b/devtools/shared/specs/worker/push-subscription.js
new file mode 100644
index 0000000000..f68a74eb00
--- /dev/null
+++ b/devtools/shared/specs/worker/push-subscription.js
@@ -0,0 +1,12 @@
+/* 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";
+
+const { generateActorSpec } = require("resource://devtools/shared/protocol.js");
+
+const pushSubscriptionSpec = generateActorSpec({
+  typeName: "pushSubscription",
+});
+
+exports.pushSubscriptionSpec = pushSubscriptionSpec;
diff --git a/devtools/shared/specs/worker/service-worker-registration.js b/devtools/shared/specs/worker/service-worker-registration.js
new file mode 100644
index 0000000000..b6b0fd5286
--- /dev/null
+++ b/devtools/shared/specs/worker/service-worker-registration.js
@@ -0,0 +1,48 @@
+/* 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";
+
+const {
+  RetVal,
+  generateActorSpec,
+} = require("resource://devtools/shared/protocol.js");
+
+const serviceWorkerRegistrationSpec = generateActorSpec({
+  typeName: "serviceWorkerRegistration",
+
+  events: {
+    "push-subscription-modified": {
+      type: "push-subscription-modified",
+    },
+    "registration-changed": {
+      type: "registration-changed",
+    },
+  },
+
+  methods: {
+    allowShutdown: {
+      request: {},
+    },
+    preventShutdown: {
+      request: {},
+    },
+    push: {
+      request: {},
+    },
+    start: {
+      request: {},
+    },
+    unregister: {
+      request: {},
+    },
+    getPushSubscription: {
+      request: {},
+      response: {
+        subscription: RetVal("nullable:pushSubscription"),
+      },
+    },
+  },
+});
+
+exports.serviceWorkerRegistrationSpec = serviceWorkerRegistrationSpec;
diff --git a/devtools/shared/specs/worker/service-worker.js b/devtools/shared/specs/worker/service-worker.js
new file mode 100644
index 0000000000..8ddf151890
--- /dev/null
+++ b/devtools/shared/specs/worker/service-worker.js
@@ -0,0 +1,12 @@
+/* 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";
+
+const { generateActorSpec } = require("resource://devtools/shared/protocol.js");
+
+const serviceWorkerSpec = generateActorSpec({
+  typeName: "serviceWorker",
+});
+
+exports.serviceWorkerSpec = serviceWorkerSpec;