diff --git a/browser/devtools/markupview/markup-view.js b/browser/devtools/markupview/markup-view.js
index 24b67f251e3..5927c3fa711 100644
--- a/browser/devtools/markupview/markup-view.js
+++ b/browser/devtools/markupview/markup-view.js
@@ -18,6 +18,7 @@ const GRAB_DELAY = 400;
 const DRAG_DROP_AUTOSCROLL_EDGE_DISTANCE = 50;
 const DRAG_DROP_MIN_AUTOSCROLL_SPEED = 5;
 const DRAG_DROP_MAX_AUTOSCROLL_SPEED = 15;
+const AUTOCOMPLETE_POPUP_PANEL_ID = "markupview_autoCompletePopup";
 
 const {UndoStack} = require("devtools/shared/undo");
 const {editableField, InplaceEditor} = require("devtools/shared/inplace-editor");
@@ -85,7 +86,10 @@ function MarkupView(aInspector, aFrame, aControllerWindow) {
   // Creating the popup to be used to show CSS suggestions.
   let options = {
     autoSelect: true,
-    theme: "auto"
+    theme: "auto",
+    // panelId option prevents the markupView autocomplete popup from
+    // sharing XUL elements with other views, such as ruleView (see Bug 1191093)
+    panelId: AUTOCOMPLETE_POPUP_PANEL_ID
   };
   this.popup = new AutocompletePopup(this.doc.defaultView.parent.document, options);
 
diff --git a/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_01.js b/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_01.js
index 42e4b698494..683c6776fe7 100644
--- a/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_01.js
+++ b/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_01.js
@@ -61,6 +61,15 @@ add_task(function*() {
   yield addTab(TEST_URL);
   let {toolbox, inspector, view} = yield openRuleView();
 
+  info("Test autocompletion after 1st page load");
+  yield runAutocompletionTest(toolbox, inspector, view);
+
+  info("Test autocompletion after page navigation");
+  yield reloadPage(inspector);
+  yield runAutocompletionTest(toolbox, inspector, view);
+});
+
+function* runAutocompletionTest(toolbox, inspector, view) {
   info("Selecting the test node");
   yield selectNode("h1", inspector);
 
@@ -69,10 +78,10 @@ add_task(function*() {
   let editor = yield focusEditableField(view, propertyName);
 
   info("Starting to test for css property completion");
-  for (let i = 0; i < testData.length; i ++) {
+  for (let i = 0; i < testData.length; i++) {
     yield testCompletion(testData[i], editor, view);
   }
-});
+}
 
 function* testCompletion([key, completion, index, total], editor, view) {
   info("Pressing key " + key);
diff --git a/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_02.js b/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_02.js
index fd65892f6fd..035be57dd33 100644
--- a/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_02.js
+++ b/browser/devtools/styleinspector/test/browser_ruleview_completion-existing-property_02.js
@@ -43,6 +43,15 @@ add_task(function*() {
   yield addTab(TEST_URL);
   let {toolbox, inspector, view} = yield openRuleView();
 
+  info("Test autocompletion after 1st page load");
+  yield runAutocompletionTest(toolbox, inspector, view);
+
+  info("Test autocompletion after page navigation");
+  yield reloadPage(inspector);
+  yield runAutocompletionTest(toolbox, inspector, view);
+});
+
+function* runAutocompletionTest(toolbox, inspector, view) {
   info("Selecting the test node");
   yield selectNode("h1", inspector);
 
@@ -51,13 +60,13 @@ add_task(function*() {
   let editor = yield focusEditableField(view, value);
 
   info("Starting to test for css property completion");
-  for (let i = 0; i < testData.length; i ++) {
+  for (let i = 0; i < testData.length; i++) {
     // Re-define the editor at each iteration, because the focus may have moved
     // from property to value and back
     editor = inplaceEditor(view.styleDocument.activeElement);
     yield testCompletion(testData[i], editor, view);
   }
-});
+}
 
 function* testCompletion([key, modifiers, completion, index, total], editor, view) {
   info("Pressing key " + key);
diff --git a/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_01.js b/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_01.js
index 546b8733b16..6be099827f9 100644
--- a/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_01.js
+++ b/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_01.js
@@ -44,6 +44,15 @@ add_task(function*() {
   yield addTab(TEST_URL);
   let {toolbox, inspector, view} = yield openRuleView();
 
+  info("Test autocompletion after 1st page load");
+  yield runAutocompletionTest(toolbox, inspector, view);
+
+  info("Test autocompletion after page navigation");
+  yield reloadPage(inspector);
+  yield runAutocompletionTest(toolbox, inspector, view);
+});
+
+function* runAutocompletionTest(toolbox, inspector, view) {
   info("Selecting the test node");
   yield selectNode("h1", inspector);
 
@@ -52,10 +61,10 @@ add_task(function*() {
   let editor = yield focusEditableField(view, brace);
 
   info("Starting to test for css property completion");
-  for (let i = 0; i < testData.length; i ++) {
+  for (let i = 0; i < testData.length; i++) {
     yield testCompletion(testData[i], editor, view);
   }
-});
+}
 
 function* testCompletion([key, completion, index, total], editor, view) {
   info("Pressing key " + key);
diff --git a/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_02.js b/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_02.js
index c70f6067bed..ff9df05b328 100644
--- a/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_02.js
+++ b/browser/devtools/styleinspector/test/browser_ruleview_completion-new-property_02.js
@@ -46,6 +46,15 @@ add_task(function*() {
   yield addTab(TEST_URL);
   let {toolbox, inspector, view} = yield openRuleView();
 
+  info("Test autocompletion after 1st page load");
+  yield runAutocompletionTest(toolbox, inspector, view);
+
+  info("Test autocompletion after page navigation");
+  yield reloadPage(inspector);
+  yield runAutocompletionTest(toolbox, inspector, view);
+});
+
+function* runAutocompletionTest(toolbox, inspector, view) {
   info("Selecting the test node");
   yield selectNode("h1", inspector);
 
@@ -60,7 +69,7 @@ add_task(function*() {
     editor = inplaceEditor(view.styleDocument.activeElement);
     yield testCompletion(testData[i], editor, view);
   }
-});
+}
 
 function* testCompletion([key, modifiers, completion, index, total], editor, view) {
   info("Pressing key " + key);
diff --git a/browser/devtools/styleinspector/test/browser_ruleview_user-property-reset.js b/browser/devtools/styleinspector/test/browser_ruleview_user-property-reset.js
index 97dad01ba88..0bb5bc67018 100644
--- a/browser/devtools/styleinspector/test/browser_ruleview_user-property-reset.js
+++ b/browser/devtools/styleinspector/test/browser_ruleview_user-property-reset.js
@@ -82,9 +82,3 @@ function* assertRuleAndMarkupViewWidth(id, value, ruleView, inspector) {
   let attr = yield getContainerStyleAttrValue(id, inspector);
   is(attr.textContent.replace(/\s/g, ""), "width:" + value + ";", "Markup-view style attribute width is " + value);
 }
-
-function reloadPage(inspector) {
-  let onNewRoot = inspector.once("new-root");
-  content.location.reload();
-  return onNewRoot.then(inspector.markup._waitForChildren);
-}
diff --git a/browser/devtools/styleinspector/test/head.js b/browser/devtools/styleinspector/test/head.js
index 5721ada773d..3a96ac4b86e 100644
--- a/browser/devtools/styleinspector/test/head.js
+++ b/browser/devtools/styleinspector/test/head.js
@@ -999,3 +999,16 @@ function waitForStyleEditor(toolbox, href) {
 
   return def.promise;
 }
+
+/**
+ * Reload the current page and wait for the inspector to be initialized after
+ * the navigation
+ * @param {InspectorPanel} inspector
+ *        The instance of InspectorPanel currently loaded in the toolbox
+ * @return a promise that resolves after page reload and inspector initialization
+ */
+function reloadPage(inspector) {
+  let onNewRoot = inspector.once("new-root");
+  content.location.reload();
+  return onNewRoot.then(inspector.markup._waitForChildren);
+}