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diff --git a/devtools/server/actors/style-sheet.js b/devtools/server/actors/style-sheet.js
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+++ b/devtools/server/actors/style-sheet.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { Ci } = require("chrome");
+const protocol = require("devtools/shared/protocol");
+const { LongStringActor } = require("devtools/server/actors/string");
+const { MediaRuleActor } = require("devtools/server/actors/media-rule");
+const { fetch } = require("devtools/shared/DevToolsUtils");
+const { styleSheetSpec } = require("devtools/shared/specs/style-sheet");
+const InspectorUtils = require("InspectorUtils");
+const {
+  getSourcemapBaseURL,
+} = require("devtools/server/actors/utils/source-map-utils");
+
+loader.lazyRequireGetter(
+  this,
+  "CssLogic",
+  "devtools/shared/inspector/css-logic"
+);
+loader.lazyRequireGetter(
+  this,
+  ["addPseudoClassLock", "removePseudoClassLock"],
+  "devtools/server/actors/highlighters/utils/markup",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "loadSheet",
+  "devtools/shared/layout/utils",
+  true
+);
+
+var TRANSITION_PSEUDO_CLASS = ":-moz-styleeditor-transitioning";
+var TRANSITION_DURATION_MS = 500;
+var TRANSITION_BUFFER_MS = 1000;
+var TRANSITION_RULE_SELECTOR = `:root${TRANSITION_PSEUDO_CLASS}, :root${TRANSITION_PSEUDO_CLASS} *`;
+
+var TRANSITION_SHEET =
+  "data:text/css;charset=utf-8," +
+  encodeURIComponent(`
+  ${TRANSITION_RULE_SELECTOR} {
+    transition-duration: ${TRANSITION_DURATION_MS}ms !important;
+    transition-delay: 0ms !important;
+    transition-timing-function: ease-out !important;
+    transition-property: all !important;
+  }
+`);
+
+// The possible kinds of style-applied events.
+// UPDATE_PRESERVING_RULES means that the update is guaranteed to
+// preserve the number and order of rules on the style sheet.
+// UPDATE_GENERAL covers any other kind of change to the style sheet.
+const UPDATE_PRESERVING_RULES = 0;
+exports.UPDATE_PRESERVING_RULES = UPDATE_PRESERVING_RULES;
+const UPDATE_GENERAL = 1;
+exports.UPDATE_GENERAL = UPDATE_GENERAL;
+
+// If the user edits a style sheet, we stash a copy of the edited text
+// here, keyed by the style sheet.  This way, if the tools are closed
+// and then reopened, the edited text will be available.  A weak map
+// is used so that navigation by the user will eventually cause the
+// edited text to be collected.
+const modifiedStyleSheets = new WeakMap();
+
+function getSheetText(sheet) {
+  const cssText = modifiedStyleSheets.get(sheet);
+  if (cssText !== undefined) {
+    return Promise.resolve(cssText);
+  }
+
+  if (!sheet.href) {
+    // this is an inline <style> sheet
+    const content = sheet.ownerNode.textContent;
+    return Promise.resolve(content);
+  }
+
+  return fetchStylesheet(sheet).then(({ content }) => content);
+}
+
+exports.getSheetText = getSheetText;
+
+/**
+ * Get the charset of the stylesheet.
+ */
+function getCSSCharset(sheet) {
+  if (sheet) {
+    // charset attribute of <link> or <style> element, if it exists
+    if (sheet.ownerNode?.getAttribute) {
+      const linkCharset = sheet.ownerNode.getAttribute("charset");
+      if (linkCharset != null) {
+        return linkCharset;
+      }
+    }
+
+    // charset of referring document.
+    if (sheet.ownerNode?.ownerDocument.characterSet) {
+      return sheet.ownerNode.ownerDocument.characterSet;
+    }
+  }
+
+  return "UTF-8";
+}
+
+/**
+ * Fetch a stylesheet at the provided URL. Returns a promise that will resolve the
+ * result of the fetch command.
+ *
+ * @return {Promise} a promise that resolves with an object with the following members
+ *         on success:
+ *           - content: the document at that URL, as a string,
+ *           - contentType: the content type of the document
+ *         If an error occurs, the promise is rejected with that error.
+ */
+async function fetchStylesheet(sheet) {
+  const href = sheet.href;
+
+  const options = {
+    loadFromCache: true,
+    policy: Ci.nsIContentPolicy.TYPE_INTERNAL_STYLESHEET,
+    charset: getCSSCharset(sheet),
+  };
+
+  // Bug 1282660 - We use the system principal to load the default internal
+  // stylesheets instead of the content principal since such stylesheets
+  // require system principal to load. At meanwhile, we strip the loadGroup
+  // for preventing the assertion of the userContextId mismatching.
+
+  // chrome|file|resource|moz-extension protocols rely on the system principal.
+  const excludedProtocolsRe = /^(chrome|file|resource|moz-extension):\/\//;
+  if (!excludedProtocolsRe.test(href)) {
+    // Stylesheets using other protocols should use the content principal.
+    if (sheet.ownerNode) {
+      // eslint-disable-next-line mozilla/use-ownerGlobal
+      options.window = sheet.ownerNode.ownerDocument.defaultView;
+      options.principal = sheet.ownerNode.ownerDocument.nodePrincipal;
+    }
+  }
+
+  let result;
+
+  try {
+    result = await fetch(href, options);
+  } catch (e) {
+    // The list of excluded protocols can be missing some protocols, try to use the
+    // system principal if the first fetch failed.
+    console.error(
+      `stylesheets actor: fetch failed for ${href},` +
+        ` using system principal instead.`
+    );
+    options.window = undefined;
+    options.principal = undefined;
+    result = await fetch(href, options);
+  }
+
+  return result;
+}
+
+/**
+ * A StyleSheetActor represents a stylesheet on the server.
+ */
+var StyleSheetActor = protocol.ActorClassWithSpec(styleSheetSpec, {
+  toString: function() {
+    return "[StyleSheetActor " + this.actorID + "]";
+  },
+
+  /**
+   * Window of target
+   */
+  get window() {
+    return this.parentActor.window;
+  },
+
+  /**
+   * Document of target.
+   */
+  get document() {
+    return this.window.document;
+  },
+
+  /**
+   * StyleSheet's window.
+   */
+  get ownerWindow() {
+    // eslint-disable-next-line mozilla/use-ownerGlobal
+    return this.ownerDocument.defaultView;
+  },
+
+  get ownerNode() {
+    return this.rawSheet.ownerNode;
+  },
+
+  /**
+   * URL of underlying stylesheet.
+   */
+  get href() {
+    return this.rawSheet.href;
+  },
+
+  /**
+   * Returns the stylesheet href or the document href if the sheet is inline.
+   */
+  get safeHref() {
+    let href = this.href;
+    if (!href) {
+      if (this.ownerNode.nodeType == this.ownerNode.DOCUMENT_NODE) {
+        href = this.ownerNode.location.href;
+      } else if (
+        this.ownerNode.ownerDocument &&
+        this.ownerNode.ownerDocument.location
+      ) {
+        href = this.ownerNode.ownerDocument.location.href;
+      }
+    }
+    return href;
+  },
+
+  /**
+   * Retrieve the index (order) of stylesheet in the document.
+   *
+   * @return number
+   */
+  get styleSheetIndex() {
+    if (this._styleSheetIndex == -1) {
+      const styleSheets = InspectorUtils.getAllStyleSheets(this.document, true);
+      for (let i = 0; i < styleSheets.length; i++) {
+        if (styleSheets[i] == this.rawSheet) {
+          this._styleSheetIndex = i;
+          break;
+        }
+      }
+    }
+    return this._styleSheetIndex;
+  },
+
+  destroy: function() {
+    if (this._transitionTimeout && this.window) {
+      this.window.clearTimeout(this._transitionTimeout);
+      removePseudoClassLock(
+        this.document.documentElement,
+        TRANSITION_PSEUDO_CLASS
+      );
+    }
+    protocol.Actor.prototype.destroy.call(this);
+  },
+
+  initialize: function(styleSheet, parentActor) {
+    protocol.Actor.prototype.initialize.call(this, parentActor.conn);
+
+    this.rawSheet = styleSheet;
+    this.parentActor = parentActor;
+    this.conn = this.parentActor.conn;
+
+    // text and index are unknown until source load
+    this.text = null;
+    this._styleSheetIndex = -1;
+
+    // When the style is imported, `styleSheet.ownerNode` is null,
+    // so retrieve the topmost parent style sheet which has an ownerNode
+    let parentStyleSheet = styleSheet;
+    while (parentStyleSheet.parentStyleSheet) {
+      parentStyleSheet = parentStyleSheet.parentStyleSheet;
+    }
+    // When the style is injected via nsIDOMWindowUtils.loadSheet, even
+    // the parent style sheet has no owner, so default back to target actor
+    // document
+    if (parentStyleSheet.ownerNode) {
+      this.ownerDocument = parentStyleSheet.ownerNode.ownerDocument;
+    } else {
+      this.ownerDocument = parentActor.window;
+    }
+  },
+
+  /**
+   * Test whether this sheet has been modified by CSSOM.
+   * @return {Boolean} true if changed by CSSOM.
+   */
+  hasRulesModifiedByCSSOM: function() {
+    return InspectorUtils.hasRulesModifiedByCSSOM(this.rawSheet);
+  },
+
+  /**
+   * Get the raw stylesheet's cssRules once the sheet has been loaded.
+   *
+   * @return {Promise}
+   *         Promise that resolves with a CSSRuleList
+   */
+  getCSSRules: function() {
+    let rules;
+    try {
+      rules = this.rawSheet.cssRules;
+    } catch (e) {
+      // sheet isn't loaded yet
+    }
+
+    if (rules) {
+      return Promise.resolve(rules);
+    }
+
+    if (!this.ownerNode) {
+      return Promise.resolve([]);
+    }
+
+    if (this._cssRules) {
+      return this._cssRules;
+    }
+
+    // cache so we don't add many listeners if this is called multiple times.
+    this._cssRules = new Promise(resolve => {
+      const onSheetLoaded = event => {
+        this.ownerNode.removeEventListener("load", onSheetLoaded);
+
+        resolve(this.rawSheet.cssRules);
+      };
+
+      this.ownerNode.addEventListener("load", onSheetLoaded);
+    });
+
+    return this._cssRules;
+  },
+
+  /**
+   * Get the current state of the actor
+   *
+   * @return {object}
+   *         With properties of the underlying stylesheet, plus 'text',
+   *        'styleSheetIndex' and 'parentActor' if it's @imported
+   */
+  form: function() {
+    let docHref;
+    if (this.ownerNode) {
+      if (this.ownerNode.nodeType == this.ownerNode.DOCUMENT_NODE) {
+        docHref = this.ownerNode.location.href;
+      } else if (
+        this.ownerNode.ownerDocument &&
+        this.ownerNode.ownerDocument.location
+      ) {
+        docHref = this.ownerNode.ownerDocument.location.href;
+      }
+    }
+
+    const form = {
+      actor: this.actorID, // actorID is set when this actor is added to a pool
+      href: this.href,
+      nodeHref: docHref,
+      disabled: this.rawSheet.disabled,
+      title: this.rawSheet.title,
+      system: CssLogic.isAgentStylesheet(this.rawSheet),
+      styleSheetIndex: this.styleSheetIndex,
+      sourceMapBaseURL: getSourcemapBaseURL(
+        // Technically resolveSourceURL should be used here alongside
+        // "this.rawSheet.sourceURL", but the style inspector does not support
+        // /*# sourceURL=*/ in CSS, so we're omitting it here (bug 880831).
+        this.href || docHref,
+        this.ownerWindow
+      ),
+      sourceMapURL: this.rawSheet.sourceMapURL,
+    };
+
+    try {
+      form.ruleCount = this.rawSheet.cssRules.length;
+    } catch (e) {
+      // stylesheet had an @import rule that wasn't loaded yet
+      this.getCSSRules().then(() => {
+        this._notifyPropertyChanged("ruleCount");
+      });
+    }
+    return form;
+  },
+
+  /**
+   * Toggle the disabled property of the style sheet
+   *
+   * @return {object}
+   *         'disabled' - the disabled state after toggling.
+   */
+  toggleDisabled: function() {
+    this.rawSheet.disabled = !this.rawSheet.disabled;
+    this._notifyPropertyChanged("disabled");
+
+    return this.rawSheet.disabled;
+  },
+
+  /**
+   * Send an event notifying that a property of the stylesheet
+   * has changed.
+   *
+   * @param  {string} property
+   *         Name of the changed property
+   */
+  _notifyPropertyChanged: function(property) {
+    this.emit("property-change", property, this.form()[property]);
+  },
+
+  /**
+   * Protocol method to get the text of this stylesheet.
+   */
+  getText: function() {
+    return this._getText().then(text => {
+      return new LongStringActor(this.conn, text || "");
+    });
+  },
+
+  /**
+   * Fetch the text for this stylesheet from the cache or network. Return
+   * cached text if it's already been fetched.
+   *
+   * @return {Promise}
+   *         Promise that resolves with a string text of the stylesheet.
+   */
+  _getText: function() {
+    if (typeof this.text === "string") {
+      return Promise.resolve(this.text);
+    }
+
+    return getSheetText(this.rawSheet).then(text => {
+      this.text = text;
+      return text;
+    });
+  },
+
+  /**
+   * Protocol method to get the media rules for the stylesheet.
+   */
+  getMediaRules: function() {
+    return this._getMediaRules();
+  },
+
+  /**
+   * Get all the @media rules in this stylesheet.
+   *
+   * @return {promise}
+   *         A promise that resolves with an array of MediaRuleActors.
+   */
+  _getMediaRules: function() {
+    return this.getCSSRules().then(rules => {
+      const mediaRules = [];
+      for (let i = 0; i < rules.length; i++) {
+        const rule = rules[i];
+        if (rule.type != CSSRule.MEDIA_RULE) {
+          continue;
+        }
+        const actor = new MediaRuleActor(rule, this);
+        this.manage(actor);
+
+        mediaRules.push(actor);
+      }
+      return mediaRules;
+    });
+  },
+
+  /**
+   * Update the style sheet in place with new text.
+   *
+   * @param {string} text: new text
+   * @param {boolean} transition: whether to do CSS transition for change.
+   * @param {string} kind: either UPDATE_PRESERVING_RULES or UPDATE_GENERAL
+   * @param {string|null} cause: indicates the cause of this update
+   */
+  update: function(text, transition, kind = UPDATE_GENERAL, cause) {
+    InspectorUtils.parseStyleSheet(this.rawSheet, text);
+
+    modifiedStyleSheets.set(this.rawSheet, text);
+
+    this.text = text;
+
+    if (kind != UPDATE_PRESERVING_RULES) {
+      this._notifyPropertyChanged("ruleCount");
+    }
+
+    if (transition) {
+      this._startTransition(kind, cause);
+    } else {
+      this.emit("style-applied", kind, this, cause);
+    }
+
+    this._getMediaRules().then(rules => {
+      this.emit("media-rules-changed", rules);
+    });
+  },
+
+  /**
+   * Insert a catch-all transition sheet into the document. Set a timeout
+   * to remove the transition after a certain time.
+   *
+   * @param {string} kind: either UPDATE_PRESERVING_RULES or UPDATE_GENERAL
+   * @param {string|null} cause: indicates the cause of this update
+   */
+  _startTransition: function(kind, cause) {
+    if (!this._transitionSheetLoaded) {
+      this._transitionSheetLoaded = true;
+      // We don't remove this sheet. It uses an internal selector that
+      // we only apply via locks, so there's no need to load and unload
+      // it all the time.
+      loadSheet(this.window, TRANSITION_SHEET);
+    }
+
+    addPseudoClassLock(this.document.documentElement, TRANSITION_PSEUDO_CLASS);
+
+    // Set up clean up and commit after transition duration (+buffer)
+    // @see _onTransitionEnd
+    this.window.clearTimeout(this._transitionTimeout);
+    this._transitionTimeout = this.window.setTimeout(
+      this._onTransitionEnd.bind(this, kind, cause),
+      TRANSITION_DURATION_MS + TRANSITION_BUFFER_MS
+    );
+  },
+
+  /**
+   * This cleans up class and rule added for transition effect and then
+   * notifies that the style has been applied.
+   *
+   * @param {string} kind: either UPDATE_PRESERVING_RULES or UPDATE_GENERAL
+   * @param {string|null} cause: indicates the cause of this update
+   */
+  _onTransitionEnd: function(kind, cause) {
+    this._transitionTimeout = null;
+    removePseudoClassLock(
+      this.document.documentElement,
+      TRANSITION_PSEUDO_CLASS
+    );
+    this.emit("style-applied", kind, this, cause);
+  },
+});
+
+exports.StyleSheetActor = StyleSheetActor;