--- a/inspector-actor-pseudoclass.diff
+++ b/inspector-actor-pseudoclass.diff
@@ -1,14 +1,14 @@
 # HG changeset patch
 # User Dave Camp <dcamp@mozilla.com>
 # Date 1370924321 25200
 #      Mon Jun 10 21:18:41 2013 -0700
 # Node ID b400cc70cce3af826333cb4fc51109420cf74e5b
-# Parent  51766479c3c9b9c3ec81f9109babbfe726c9654d
+# Parent 6463faecc4d6b040b3f663f33f69af7a01c62165
 [mq]: inspector-actor-pseudoclass.diff
 
 diff --git a/toolkit/devtools/server/actors/inspector.js b/toolkit/devtools/server/actors/inspector.js
 --- a/toolkit/devtools/server/actors/inspector.js
 +++ b/toolkit/devtools/server/actors/inspector.js
 @@ -47,16 +47,18 @@ const protocol = require("devtools/serve
  const {Arg, Option, method, RetVal, types} = protocol;
  const {LongStringActor, ShortLongString} = require("devtools/server/actors/string");
@@ -75,17 +75,17 @@ diff --git a/toolkit/devtools/server/act
    /**
     * Returns a LongStringActor with the node's value.
     */
    getNodeValue: method(function() {
      return new LongStringActor(this.conn, this.rawNode.nodeValue || "");
    }, {
      request: {},
      response: {
-@@ -280,16 +298,18 @@ let NodeFront = protocol.FrontClass(Node
+@@ -282,16 +300,18 @@ let NodeFront = protocol.FrontClass(Node
            name: change.attributeName,
            namespace: change.attributeNamespace,
            value: change.newValue
          });
        }
      } else if (change.type === "characterData") {
        this._form.shortValue = change.newValue;
        this._form.incompleteValue = change.incompleteValue;
@@ -94,17 +94,17 @@ diff --git a/toolkit/devtools/server/act
      }
    },
  
    // Some accessors to make NodeFront feel more like an nsIDOMNode
  
    get id() this.getAttribute("id"),
  
    get nodeType() this._form.nodeType,
-@@ -318,16 +338,21 @@ let NodeFront = protocol.FrontClass(Node
+@@ -320,16 +340,21 @@ let NodeFront = protocol.FrontClass(Node
    },
    hasAttribute: function(name) {
      this._cacheAttributes();
      return (name in this._attrMap);
    },
  
    get attributes() this._form.attrs,
  
@@ -116,35 +116,35 @@ diff --git a/toolkit/devtools/server/act
    getNodeValue: protocol.custom(function() {
      if (!this.incompleteValue) {
        return delayedResolve(new ShortLongString(this.shortValue));
      } else {
        return this._getNodeValue();
      }
    }, {
      impl: "_getNodeValue"
-@@ -634,16 +659,17 @@ var WalkerActor = protocol.ActorClass({
+@@ -636,16 +661,17 @@ var WalkerActor = protocol.ActorClass({
     * @param DebuggerServerConnection conn
     *    The server connection.
     */
    initialize: function(conn, document, webProgress, options) {
      protocol.Actor.prototype.initialize.call(this, conn);
      this.rootDoc = document;
      this._refMap = new Map();
      this._pendingMutations = [];
 +    this._activePseudoClassLocks = new Set();
  
      // Nodes which have been removed from the client's known
      // ownership tree are considered "orphaned", and stored in
      // this set.
      this._orphaned = new Set();
  
-     this.onMutations = this.onMutations.bind(this);
-     this.onFrameLoad = this.onFrameLoad.bind(this);
-@@ -668,24 +694,29 @@ var WalkerActor = protocol.ActorClass({
+     // The client can tell the walker that it is interested in a node
+     // even when it is orphaned with the `retainNode` method.  This
+@@ -675,24 +701,29 @@ var WalkerActor = protocol.ActorClass({
    },
  
    toString: function() {
      return "[WalkerActor " + this.actorID + "]";
    },
  
    destroy: function() {
      protocol.Actor.prototype.destroy.call(this);
@@ -164,17 +164,17 @@ diff --git a/toolkit/devtools/server/act
        this._refMap.delete(actor.rawNode);
      }
      protocol.Actor.prototype.unmanage.call(this, actor);
    },
  
    _ref: function(node) {
      let actor = this._refMap.get(node);
      if (actor) return actor;
-@@ -1073,16 +1104,147 @@ var WalkerActor = protocol.ActorClass({
+@@ -1130,16 +1161,141 @@ var WalkerActor = protocol.ActorClass({
        selector: Arg(1)
      },
      response: {
        list: RetVal("domnodelist")
      }
    }),
  
    /**
@@ -209,27 +209,21 @@ diff --git a/toolkit/devtools/server/act
 +      node: Arg(0, "domnode"),
 +      pseudoClass: Arg(1),
 +      parents: Option(2)
 +    },
 +    response: {}
 +  }),
 +
 +  _queuePseudoClassMutation: function(node) {
-+    let needEvent = this._pendingMutations.length === 0;
-+
-+    this._pendingMutations.push({
++    this.queueMutation({
 +      target: node.actorID,
 +      type: "pseudoClassLock",
 +      pseudoClassLocks: node.writePseudoClassLocks()
 +    });
-+
-+    if (needEvent) {
-+      events.emit(this, "new-mutations");
-+    }
 +  },
 +
 +  _addPseudoClassLock: function(node, pseudo) {
 +    if (node.rawNode.nodeType !== Ci.nsIDOMNode.ELEMENT_NODE) {
 +      return false;
 +    }
 +    DOMUtils.addPseudoClassLock(node.rawNode, pseudo);
 +    this._activePseudoClassLocks.add(node);
@@ -315,25 +309,25 @@ diff --git a/toolkit/devtools/server/act
     *
     * Mutation records have a basic structure:
     *
     * {
     *   type: attributes|characterData|childList,
 diff --git a/toolkit/devtools/server/tests/mochitest/Makefile.in b/toolkit/devtools/server/tests/mochitest/Makefile.in
 --- a/toolkit/devtools/server/tests/mochitest/Makefile.in
 +++ b/toolkit/devtools/server/tests/mochitest/Makefile.in
-@@ -14,14 +14,15 @@ include $(DEPTH)/config/autoconf.mk
- MOCHITEST_CHROME_FILES	= \
+@@ -15,14 +15,15 @@ MOCHITEST_CHROME_FILES	= \
  	inspector-helpers.js \
  	inspector-traversal-data.html \
  	test_inspector-mutations-attr.html \
  	test_inspector-mutations-childlist.html \
  	test_inspector-mutations-frameload.html \
  	test_inspector-mutations-value.html \
  	test_inspector-release.html \
+ 	test_inspector-retain.html \
 +	test_inspector-pseudoclass-lock.html \
  	test_inspector-traversal.html \
  	test_unsafeDereference.html \
  	nonchrome_unsafeDereference.html \
  	$(NULL)
  
  include $(topsrcdir)/config/rules.mk
 diff --git a/toolkit/devtools/server/tests/mochitest/inspector-helpers.js b/toolkit/devtools/server/tests/mochitest/inspector-helpers.js

--- a/inspector-emit-on-destroy.diff
+++ b/inspector-emit-on-destroy.diff
@@ -1,144 +1,33 @@
 # HG changeset patch
 # User Dave Camp <dcamp@mozilla.com>
 # Date 1370924324 25200
 #      Mon Jun 10 21:18:44 2013 -0700
 # Node ID 01d60c2d12387935dc7efb6a1f9d2d4a8df9df50
-# Parent  f5cbe11c4e8aa44ca507b48acf9b0ff902f964d3
+# Parent 4a4117afe97e0823ca9ab6719135e75563662ae0
 imported patch inspector-emit-on-destroy.diff
 
 diff --git a/toolkit/devtools/server/actors/inspector.js b/toolkit/devtools/server/actors/inspector.js
 --- a/toolkit/devtools/server/actors/inspector.js
 +++ b/toolkit/devtools/server/actors/inspector.js
-@@ -1148,27 +1148,21 @@ var WalkerActor = protocol.ActorClass({
-       node: Arg(0, "domnode"),
-       pseudoClass: Arg(1),
-       parents: Option(2)
-     },
-     response: {}
-   }),
- 
-   _queuePseudoClassMutation: function(node) {
--    let needEvent = this._pendingMutations.length === 0;
--
--    this._pendingMutations.push({
-+    this._queueMutation({
-       target: node.actorID,
-       type: "pseudoClassLock",
-       pseudoClassLocks: node.writePseudoClassLocks()
-     });
--
--    if (needEvent) {
--      events.emit(this, "new-mutations");
--    }
-   },
- 
-   _addPseudoClassLock: function(node, pseudo) {
-     if (node.rawNode.nodeType !== Ci.nsIDOMNode.ELEMENT_NODE) {
-       return false;
-     }
-     DOMUtils.addPseudoClassLock(node.rawNode, pseudo);
-     this._activePseudoClassLocks.add(node);
-@@ -1306,27 +1300,37 @@ var WalkerActor = protocol.ActorClass({
-     request: {
+@@ -1362,16 +1362,21 @@ var WalkerActor = protocol.ActorClass({
        cleanup: Option(0)
      },
      response: {
        mutations: RetVal("array:dommutation")
      }
    }),
  
-+  _queueMutation: function (mutation) {
+   queueMutation: function(mutation) {
 +    if (!this.actorID) {
 +      // We've been destroyed, don't bother.
++      return;
 +    }
 +
-+    // We only send the `new-mutations` notification once, until the client
-+    // fetches mutations with the `getMutations` packet.
-+    let needEvent = this._pendingMutations.length === 0;
-+    this._pendingMutations.push(mutation);
-+    if (needEvent) {
-+      events.emit(this, "new-mutations");
-+    }
-+  },
-+
-   /**
-    * Handles mutations from the DOM mutation observer API.
-    *
-    * @param array[MutationRecord] mutations
-    *    See https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver#MutationRecord
-    */
-   onMutations: function(mutations) {
--    // We only send the `new-mutations` notification once, until the client
--    // fetches mutations with the `getMutations` packet.
--    let needEvent = this._pendingMutations.length === 0;
--
-     for (let change of mutations) {
-       let targetActor = this._refMap.get(change.target);
-       if (!targetActor) {
-         continue;
-       }
-       let targetNode = change.target;
-       let mutation = {
-         type: change.type,
-@@ -1373,58 +1377,46 @@ var WalkerActor = protocol.ActorClass({
-           // to date.
-           this._orphaned.delete(addedActor);
-           addedActors.push(addedActor.actorID);
-         }
-         mutation.numChildren = change.target.childNodes.length;
-         mutation.removed = removedActors;
-         mutation.added = addedActors;
-       }
--      this._pendingMutations.push(mutation);
--    }
--    if (needEvent && this._pendingMutations.length > 0) {
--      events.emit(this, "new-mutations");
-+      this._queueMutation(mutation);
-     }
-   },
+     // We only send the `new-mutations` notification once, until the client
+     // fetches mutations with the `getMutations` packet.
+     let needEvent = this._pendingMutations.length === 0;
  
-   onFrameLoad: function(window) {
-     let frame = window.frameElement;
-     let frameActor = this._refMap.get(frame);
-     if (!frameActor) {
-       return;
-     }
--    let needEvent = this._pendingMutations.length === 0;
--    this._pendingMutations.push({
-+    this._queueMutation({
-       type: "frameLoad",
-       target: frameActor.actorID,
-       added: [],
-       removed: []
-     });
--
--    if (needEvent) {
--      events.emit(this, "new-mutations");
--    }
-   },
+     this._pendingMutations.push(mutation);
  
-   onFrameUnload: function(window) {
-     let doc = window.document;
-     let documentActor = this._refMap.get(doc);
-     if (!documentActor) {
-       return;
-     }
- 
--    let needEvent = this._pendingMutations.length === 0;
--    this._pendingMutations.push({
-+    this._queueMutation({
-       type: "documentUnload",
-       target: documentActor.actorID
-     });
-     this.releaseNode(documentActor);
--    if (needEvent) {
--      events.emit(this, "new-mutations");
--    }
-   }
- });
- 
- /**
-  * Client side of the DOM walker.
-  */
- var WalkerFront = exports.WalkerFront = protocol.FrontClass(WalkerActor, {
-   // Set to true if cleanup should be requested after every mutation list.
+     if (needEvent) {
+       events.emit(this, "new-mutations");

--- a/inspector-set-attributes.diff
+++ b/inspector-set-attributes.diff
@@ -1,20 +1,20 @@
 # HG changeset patch
 # User Dave Camp <dcamp@mozilla.com>
 # Date 1370924324 25200
 #      Mon Jun 10 21:18:44 2013 -0700
 # Node ID 74d92274a4d13923e27b5a55f6803d4428998013
-# Parent  93e8a0e236e6dd15bc061cc02f7e286f2540048d
+# Parent 7372255e1d231ce7b01428b3bb273ed2580a1378
 imported patch inspector-set-attributes.diff
 
 diff --git a/toolkit/devtools/server/actors/inspector.js b/toolkit/devtools/server/actors/inspector.js
 --- a/toolkit/devtools/server/actors/inspector.js
 +++ b/toolkit/devtools/server/actors/inspector.js
-@@ -1237,16 +1237,54 @@ var WalkerActor = protocol.ActorClass({
+@@ -1296,16 +1296,54 @@ var WalkerActor = protocol.ActorClass({
    }, {
      request: {
        node: Arg(0, "domnode", { optional: true }),
      },
      response: {}
    }),
  
    /**
@@ -59,41 +59,41 @@ diff --git a/toolkit/devtools/server/act
     * Get a node's innerHTML property.
     */
    innerHTML: method(function(node) {
      return LongStringActor(this.conn, node.rawNode.innerHTML);
    }, {
      request: {
        node: Arg(0, "domnode")
      },
-@@ -1496,16 +1534,23 @@ var WalkerFront = exports.WalkerFront = 
+@@ -1638,16 +1676,23 @@ var WalkerFront = exports.WalkerFront = 
+   querySelector: protocol.custom(function(queryNode, selector) {
      return this._querySelector(queryNode, selector).then(response => {
        return response.node;
      });
    }, {
      impl: "_querySelector"
    }),
  
-   /**
++  /**
 +   * Return a new AttributeModificationList for this node.
 +   */
 +  startModifyingAttributes: function(node) {
 +    return AttributeModificationList(this, node);
 +  },
 +
-+  /**
-    * Get any unprocessed mutation records and process them.
-    */
-   getMutations: protocol.custom(function(options={}) {
-     return this._getMutations(options).then(mutations => {
-       let emitMutations = [];
-       for (let change of mutations) {
-         // The target is only an actorID, get the associated front.
-         let targetID = change.target;
-@@ -1620,16 +1665,60 @@ var WalkerFront = exports.WalkerFront = 
+   _releaseFront: function(node, force) {
+     if (node.retained && !force) {
+       node.reparent(null);
+       this._retainedOrphans.add(node);
+       return;
+     }
+ 
+     if (node.retained) {
+@@ -1796,16 +1841,60 @@ var WalkerFront = exports.WalkerFront = 
      for (let extraActor of extras) {
        nodeType.read(nodeType.write(extraActor, walkerActor), this);
      }
      return returnNode;
    }
  });
  
  /**
@@ -162,19 +162,19 @@ diff --git a/toolkit/devtools/server/tes
  	inspector-helpers.js \
  	inspector-traversal-data.html \
 +	test_inspector-changeattrs.html \
  	test_inspector-mutations-attr.html \
  	test_inspector-mutations-childlist.html \
  	test_inspector-mutations-frameload.html \
  	test_inspector-mutations-value.html \
  	test_inspector-release.html \
+ 	test_inspector-retain.html \
  	test_inspector-pseudoclass-lock.html \
  	test_inspector-traversal.html \
- 	test_unsafeDereference.html \
 diff --git a/toolkit/devtools/server/tests/mochitest/test_inspector-changeattrs.html b/toolkit/devtools/server/tests/mochitest/test_inspector-changeattrs.html
 new file mode 100644
 --- /dev/null
 +++ b/toolkit/devtools/server/tests/mochitest/test_inspector-changeattrs.html
 @@ -0,0 +1,102 @@
 +<!DOCTYPE HTML>
 +<html>
 +<!--

--- a/inspector-set-nodevalue.diff
+++ b/inspector-set-nodevalue.diff
@@ -1,20 +1,20 @@
 # HG changeset patch
 # User Dave Camp <dcamp@mozilla.com>
 # Date 1370924324 25200
 #      Mon Jun 10 21:18:44 2013 -0700
 # Node ID e163463312617c7f367e3abff148098d570af2e3
-# Parent  74d92274a4d13923e27b5a55f6803d4428998013
+# Parent 7652ac23f3b284f200aebcd722285609bdd59b9f
 imported patch inspector-set-nodevalue.diff
 
 diff --git a/toolkit/devtools/server/actors/inspector.js b/toolkit/devtools/server/actors/inspector.js
 --- a/toolkit/devtools/server/actors/inspector.js
 +++ b/toolkit/devtools/server/actors/inspector.js
-@@ -1275,16 +1275,32 @@ var WalkerActor = protocol.ActorClass({
+@@ -1334,16 +1334,32 @@ var WalkerActor = protocol.ActorClass({
      request: {
        node: Arg(0, "domnode"),
        modifications: Arg(1, "array:json")
      },
      response: {}
    }),
  
    /**
@@ -55,19 +55,19 @@ diff --git a/toolkit/devtools/server/tes
  	inspector-traversal-data.html \
  	test_inspector-changeattrs.html \
 +	test_inspector-changevalue.html \
  	test_inspector-mutations-attr.html \
  	test_inspector-mutations-childlist.html \
  	test_inspector-mutations-frameload.html \
  	test_inspector-mutations-value.html \
  	test_inspector-release.html \
+ 	test_inspector-retain.html \
  	test_inspector-pseudoclass-lock.html \
  	test_inspector-traversal.html \
- 	test_unsafeDereference.html \
 diff --git a/toolkit/devtools/server/tests/mochitest/test_inspector-changevalue.html b/toolkit/devtools/server/tests/mochitest/test_inspector-changevalue.html
 new file mode 100644
 --- /dev/null
 +++ b/toolkit/devtools/server/tests/mochitest/test_inspector-changevalue.html
 @@ -0,0 +1,84 @@
 +<!DOCTYPE HTML>
 +<html>
 +<!--

--- a/series
+++ b/series
@@ -5,18 +5,18 @@ inspector-actor.diff
 inspector-pathtoroot.diff
 inspector-node-tree.diff
 inspector-simple-mutations.diff
 inspector-childlist-mutations.diff
 inspector-page-navigation.diff
 inspector-drop-orphans.diff
 inspector-queue-mutations.diff
 inspector-retain.diff
+inspector-actor-pseudoclass.diff
 inspector-sibling-traversal.diff
-inspector-actor-pseudoclass.diff
 target-inspector-changes.diff
 inspector-front-islocal.diff
 inspector-emit-on-destroy.diff
 inspector-innerhtml.diff
 inspector-set-attributes.diff
 inspector-set-nodevalue.diff
 inspector-remote-target.diff
 inspector-remote-breadcrumbs.diff

--- a/target-inspector-changes.diff
+++ b/target-inspector-changes.diff
@@ -1,14 +1,14 @@
 # HG changeset patch
 # User Dave Camp <dcamp@mozilla.com>
 # Date 1370924323 25200
 #      Mon Jun 10 21:18:43 2013 -0700
 # Node ID 500c52eb1503bd918f0354a2fed1829dc0039c76
-# Parent  b400cc70cce3af826333cb4fc51109420cf74e5b
+# Parent 4e6249c3b4ea7ed7f71c4569bc61c4441d00fd7c
 imported patch target-inspector-changes.diff
 
 diff --git a/toolkit/devtools/server/actors/inspector.js b/toolkit/devtools/server/actors/inspector.js
 --- a/toolkit/devtools/server/actors/inspector.js
 +++ b/toolkit/devtools/server/actors/inspector.js
 @@ -140,16 +140,21 @@ var NodeActor = protocol.ActorClass({
        publicId: this.rawNode.publicId,
        systemId: this.rawNode.systemId,
@@ -26,17 +26,17 @@ diff --git a/toolkit/devtools/server/act
      if (this.rawNode.nodeValue) {
        // We only include a short version of the value if it's longer than
        // gValueSummaryLength
        if (this.rawNode.nodeValue.length > gValueSummaryLength) {
          form.shortValue = this.rawNode.nodeValue.substring(0, gValueSummaryLength);
          form.incompleteValue = true;
        } else {
          form.shortValue = this.rawNode.nodeValue;
-@@ -322,16 +327,18 @@ let NodeFront = protocol.FrontClass(Node
+@@ -324,16 +329,18 @@ let NodeFront = protocol.FrontClass(Node
  
    get hasChildren() this._form.numChildren > 0,
    get numChildren() this._form.numChildren,
  
    get tagName() this.nodeType === Ci.nsIDOMNode.ELEMENT_NODE ? this.nodeName : null,
    get shortValue() this._form.shortValue,
    get incompleteValue() !!this._form.incompleteValue,
  
@@ -45,17 +45,17 @@ diff --git a/toolkit/devtools/server/act
    // doctype properties
    get name() this._form.name,
    get publicId() this._form.publicId,
    get systemId() this._form.systemId,
  
    getAttribute: function(name) {
      let attr = this._getAttribute(name);
      return attr ? attr.value : null;
-@@ -419,17 +426,18 @@ let NodeFront = protocol.FrontClass(Node
+@@ -421,17 +428,18 @@ let NodeFront = protocol.FrontClass(Node
  
    /**
     * Get an nsIDOMNode for the given node front.  This only works locally,
     * and is only intended as a stopgap during the transition to the remote
     * protocol.  If you depend on this you're likely to break soon.
     */
    rawNode: function(rawNode) {
      if (!this.conn._transport._serverConnection) {
@@ -65,36 +65,17 @@ diff --git a/toolkit/devtools/server/act
      }
      let actor = this.conn._transport._serverConnection.getActor(this.actorID);
      if (!actor) {
        throw new Error("Could not find client side for actor " + this.actorID);
      }
      return actor.rawNode;
    }
  });
-@@ -1367,17 +1375,17 @@ var WalkerActor = protocol.ActorClass({
-           addedActors.push(addedActor.actorID);
-         }
-         mutation.numChildren = change.target.childNodes.length;
-         mutation.removed = removedActors;
-         mutation.added = addedActors;
-       }
-       this._pendingMutations.push(mutation);
-     }
--    if (needEvent) {
-+    if (needEvent && this._pendingMutations.length > 0) {
-       events.emit(this, "new-mutations");
-     }
-   },
- 
-   onFrameLoad: function(window) {
-     let frame = window.frameElement;
-     let frameActor = this._refMap.get(frame);
-     if (!frameActor) {
-@@ -1567,49 +1575,75 @@ var WalkerFront = exports.WalkerFront = 
+@@ -1736,49 +1744,75 @@ var WalkerFront = exports.WalkerFront = 
      // Fetch and process the mutations.
      this.getMutations({cleanup: this.autoCleanup}).then(null, console.error);
    }),
  
    // XXX hack during transition to remote inspector: get a proper NodeFront
    // for a given local node.  Only works locally.
    frontForRawNode: function(rawNode){
      if (!this.conn._transport._serverConnection) {