diff --git a/accessible/tests/browser/bounds/browser_test_resolution.js b/accessible/tests/browser/bounds/browser_test_resolution.js
index 0833ba08f3a0..2da43593324a 100644
--- a/accessible/tests/browser/bounds/browser_test_resolution.js
+++ b/accessible/tests/browser/bounds/browser_test_resolution.js
@@ -17,7 +17,7 @@ async function testScaledBounds(browser, accDoc, scale, id, type = "object") {
     getRangeExtents(acc, 0, -1, COORDTYPE_SCREEN_RELATIVE) : getBounds(acc);
 
   await ContentTask.spawn(browser, scale, _scale => {
-    setResolution(document, _scale);
+    setResolution(content.document, _scale);
   });
 
   let [scaledX, scaledY, scaledWidth, scaledHeight] = type == "text" ?
@@ -30,7 +30,7 @@ async function testScaledBounds(browser, accDoc, scale, id, type = "object") {
   isWithin(scaledY - docY, (y - docY) * scale, 2, "Wrong scaled y of " + name);
 
   await ContentTask.spawn(browser, {}, () => {
-    setResolution(document, 1.0);
+    setResolution(content.document, 1.0);
   });
 }
 
diff --git a/accessible/tests/browser/bounds/browser_test_zoom.js b/accessible/tests/browser/bounds/browser_test_zoom.js
index 89df1ac75bc2..0bf2c558a242 100644
--- a/accessible/tests/browser/bounds/browser_test_zoom.js
+++ b/accessible/tests/browser/bounds/browser_test_zoom.js
@@ -47,7 +47,7 @@ async function runTests(browser, accDoc) {
   await testContentBounds(browser, area);
 
   await ContentTask.spawn(browser, {}, () => {
-    zoomDocument(document, 2.0);
+    zoomDocument(content.document, 2.0);
   });
 
   await testContentBounds(browser, p1);
diff --git a/accessible/tests/browser/bounds/browser_test_zoom_text.js b/accessible/tests/browser/bounds/browser_test_zoom_text.js
index f5b121f6aecd..e8da8b639304 100644
--- a/accessible/tests/browser/bounds/browser_test_zoom_text.js
+++ b/accessible/tests/browser/bounds/browser_test_zoom_text.js
@@ -36,13 +36,13 @@ async function runTests(browser, accDoc) {
   await testEmptyInputNode("i1");
 
   await ContentTask.spawn(browser, {}, () => {
-    zoomDocument(document, 2.0);
+    zoomDocument(content.document, 2.0);
   });
 
   await testTextNode("p1");
 
   await ContentTask.spawn(browser, {}, () => {
-    zoomDocument(document, 1.0);
+    zoomDocument(content.document, 1.0);
   });
 }
 
diff --git a/accessible/tests/browser/browser_shutdown_remote_own_reference.js b/accessible/tests/browser/browser_shutdown_remote_own_reference.js
index 8b9cd8d29d0d..322f6ffc63a7 100644
--- a/accessible/tests/browser/browser_shutdown_remote_own_reference.js
+++ b/accessible/tests/browser/browser_shutdown_remote_own_reference.js
@@ -40,7 +40,7 @@ add_task(async function() {
     contentConsumersChanged =
       ContentTask.spawn(browser, {}, a11yConsumersChangedPromise);
     // Add a new reference to the a11y service inside the content process.
-    loadFrameScripts(browser, `let accService = Components.classes[
+    loadFrameScripts(browser, `var accService = Components.classes[
       '@mozilla.org/accessibilityService;1'].getService(
         Components.interfaces.nsIAccessibilityService);`);
     await contentConsumersChanged.then(data => Assert.deepEqual(data, {
diff --git a/accessible/tests/browser/e10s/browser_caching_name.js b/accessible/tests/browser/e10s/browser_caching_name.js
index 612a2d55e610..f41022d19151 100644
--- a/accessible/tests/browser/e10s/browser_caching_name.js
+++ b/accessible/tests/browser/e10s/browser_caching_name.js
@@ -334,7 +334,7 @@ async function testAttrRule(browser, target, rule, expected) {
     let [event] = await contentSpawnMutation(browser, {
       expected: [recreated ? [EVENT_REORDER, parent] : [EVENT_TEXT_INSERTED, id]]
     }, ([contentId, contentAttr]) =>
-      document.getElementById(contentId).removeAttribute(contentAttr), [id, attr]);
+      content.document.getElementById(contentId).removeAttribute(contentAttr), [id, attr]);
 
     // Update accessible just in case it is now defunct.
     target.acc = findAccessibleChildByID(event.accessible, id);
@@ -362,7 +362,7 @@ async function testElmRule(browser, target, rule, expected) {
   testName(acc, expected);
   let [event] = await contentSpawnMutation(browser, {
     expected: [[EVENT_REORDER, isSibling ? parent : id]]
-  }, contentElm => document.querySelector(`${contentElm}`).remove(), elm);
+  }, contentElm => content.document.querySelector(`${contentElm}`).remove(), elm);
 
   // Update accessible just in case it is now defunct.
   target.acc = findAccessibleChildByID(event.accessible, id);
@@ -387,7 +387,7 @@ async function testSubtreeRule(browser, target, rule, expected) {
   let [event] = await contentSpawnMutation(browser, {
     expected: [[EVENT_REORDER, id]]
   }, contentId => {
-    let elm = document.getElementById(contentId);
+    let elm = content.document.getElementById(contentId);
     while (elm.firstChild) {
       elm.firstChild.remove();
     }
diff --git a/accessible/tests/browser/e10s/browser_events_vcchange.js b/accessible/tests/browser/e10s/browser_events_vcchange.js
index b8d49e7eb17b..d6f530d5ba48 100644
--- a/accessible/tests/browser/e10s/browser_events_vcchange.js
+++ b/accessible/tests/browser/e10s/browser_events_vcchange.js
@@ -10,7 +10,7 @@ addAccessibleTask(`
   async function(browser, accDoc) {
     let onVCChanged = waitForEvent(EVENT_VIRTUALCURSOR_CHANGED, accDoc);
     await ContentTask.spawn(browser, null, () => {
-      let vc = getAccessible(document, nsIAccessibleDocument).virtualCursor;
+      let vc = getAccessible(content.document, Ci.nsIAccessibleDocument).virtualCursor;
       vc.position = getAccessible("p1");
     });
 
@@ -23,8 +23,8 @@ addAccessibleTask(`
 
     onVCChanged = waitForEvent(EVENT_VIRTUALCURSOR_CHANGED, accDoc);
     await ContentTask.spawn(browser, null, () => {
-      let vc = getAccessible(document, nsIAccessibleDocument).virtualCursor;
-      vc.moveNextByText(nsIAccessiblePivot.CHAR_BOUNDARY);
+      let vc = getAccessible(content.document, Ci.nsIAccessibleDocument).virtualCursor;
+      vc.moveNextByText(Ci.nsIAccessiblePivot.CHAR_BOUNDARY);
     });
     vccEvent = (await onVCChanged).QueryInterface(
       nsIAccessibleVirtualCursorChangeEvent);
@@ -35,7 +35,7 @@ addAccessibleTask(`
 
     onVCChanged = waitForEvent(EVENT_VIRTUALCURSOR_CHANGED, accDoc);
     await ContentTask.spawn(browser, null, () => {
-      let vc = getAccessible(document, nsIAccessibleDocument).virtualCursor;
+      let vc = getAccessible(content.document, Ci.nsIAccessibleDocument).virtualCursor;
       vc.position = getAccessible("input1");
     });
     vccEvent = (await onVCChanged).QueryInterface(
diff --git a/accessible/tests/browser/scroll/browser_test_zoom_text.js b/accessible/tests/browser/scroll/browser_test_zoom_text.js
index 248f42b10196..53e847461f53 100644
--- a/accessible/tests/browser/scroll/browser_test_zoom_text.js
+++ b/accessible/tests/browser/scroll/browser_test_zoom_text.js
@@ -21,7 +21,7 @@ async function runTests(browser, accDoc) {
   testTextPos(paragraph, offset, [x, docY], COORDTYPE_SCREEN_RELATIVE);
 
   await ContentTask.spawn(browser, {}, () => {
-    zoomDocument(document, 2.0);
+    zoomDocument(content.document, 2.0);
   });
 
   paragraph = findAccessibleChildByID(accDoc, "paragraph2", [nsIAccessibleText]);
diff --git a/accessible/tests/browser/tree/browser_aria_owns.js b/accessible/tests/browser/tree/browser_aria_owns.js
index 79b508b0f857..f8aa66bdd76b 100644
--- a/accessible/tests/browser/tree/browser_aria_owns.js
+++ b/accessible/tests/browser/tree/browser_aria_owns.js
@@ -16,7 +16,7 @@ addAccessibleTask(`<ul id="container"><li id="a">Test</li></ul>`,
 
     await contentSpawnMutation(browser, NO_MOVE, function() {
       // aria-own ordinal child in place, should be a no-op.
-      document.getElementById("container").setAttribute("aria-owns", "a");
+      content.document.getElementById("container").setAttribute("aria-owns", "a");
     });
 
     testChildrenIds(containerAcc, ["a"]);
@@ -32,10 +32,10 @@ addAccessibleTask(`<ul id="container"><li id="a">Test</li></ul>`,
     testChildrenIds(containerAcc, ["a"]);
 
     await contentSpawnMutation(browser, MOVE, function() {
-      let container = document.getElementById("container");
+      let container = content.document.getElementById("container");
       container.setAttribute("aria-owns", "a");
 
-      let aa = document.createElement("li");
+      let aa = content.document.createElement("li");
       aa.id = "aa";
       container.appendChild(aa);
     });
@@ -43,7 +43,7 @@ addAccessibleTask(`<ul id="container"><li id="a">Test</li></ul>`,
     testChildrenIds(containerAcc, ["aa", "a"]);
 
     await contentSpawnMutation(browser, MOVE, function() {
-      document.getElementById("container").removeAttribute("aria-owns");
+      content.document.getElementById("container").removeAttribute("aria-owns");
     });
 
     testChildrenIds(containerAcc, ["a", "aa"]);
@@ -59,7 +59,7 @@ addAccessibleTask(`<ul id="container" aria-owns="a"><li id="a">Test</li></ul>`,
 
     await contentSpawnMutation(browser, NO_MOVE, function() {
       // remove aria-owned child that is already ordinal, should be no-op.
-      document.getElementById("container").removeAttribute("aria-owns");
+      content.document.getElementById("container").removeAttribute("aria-owns");
     });
 
     testChildrenIds(containerAcc, ["a"]);
@@ -79,7 +79,7 @@ addAccessibleTask(`
     testChildrenIds(containerAcc, []);
 
     await contentSpawnMutation(browser, NO_MOVE, function() {
-      document.getElementById("container").setAttribute("aria-owns", "a");
+      content.document.getElementById("container").setAttribute("aria-owns", "a");
     });
 
     testChildrenIds(containerAcc, []);
@@ -151,7 +151,7 @@ addAccessibleTask(`
     testChildrenIds(containerAcc.firstChild, ["a", "b", "c"]);
 
     await contentSpawnMutation(browser, NO_MOVE, function() {
-      document.getElementById("container").setAttribute("aria-owns", "a c b");
+      content.document.getElementById("container").setAttribute("aria-owns", "a c b");
     });
 
     testChildrenIds(containerAcc.firstChild, ["a", "b", "c"]);
@@ -183,7 +183,7 @@ addAccessibleTask(`
 
     await contentSpawnMutation(browser, waitfor, function() {
       // Put same id twice in aria-owns
-      document.getElementById("two").setAttribute("aria-owns", "a a");
+      content.document.getElementById("two").setAttribute("aria-owns", "a a");
     });
 
     testChildrenIds(one, ["b", "c"]);
@@ -192,7 +192,7 @@ addAccessibleTask(`
     await contentSpawnMutation(browser, waitfor, function() {
       // If the previous double-id aria-owns worked correctly, we should
       // be in a good state and all is fine..
-      document.getElementById("two").setAttribute("aria-owns", "a b");
+      content.document.getElementById("two").setAttribute("aria-owns", "a b");
     });
 
     testChildrenIds(one, ["c"]);
@@ -209,10 +209,10 @@ addAccessibleTask(`<div id="a"></div><div id="b"></div>`,
     };
 
     await contentSpawnMutation(browser, waitFor, function() {
-      document.documentElement.style.display = "none";
-      document.documentElement.getBoundingClientRect();
-      document.body.setAttribute("aria-owns", "b a");
-      document.documentElement.remove();
+      content.document.documentElement.style.display = "none";
+      content.document.documentElement.getBoundingClientRect();
+      content.document.body.setAttribute("aria-owns", "b a");
+      content.document.documentElement.remove();
     });
 
     testChildrenIds(accDoc, []);
@@ -228,24 +228,24 @@ addAccessibleTask(`<div id="container"><div id="a">Hello</div></div>
     testChildrenIds(containerAcc, ["a"]);
 
     await contentSpawnMutation(browser, MOVE, function() {
-      document.getElementById("container").setAttribute("aria-owns", "c");
+      content.document.getElementById("container").setAttribute("aria-owns", "c");
     });
 
     testChildrenIds(containerAcc, ["a", "c"]);
 
     await contentSpawnMutation(browser, MOVE, function() {
-      let span = document.createElement("span");
-      document.getElementById("container").appendChild(span);
+      let span = content.document.createElement("span");
+      content.document.getElementById("container").appendChild(span);
 
-      let b = document.createElement("div");
+      let b = content.document.createElement("div");
       b.id = "b";
-      document.getElementById("container").appendChild(b);
+      content.document.getElementById("container").appendChild(b);
     });
 
     testChildrenIds(containerAcc, ["a", "b", "c"]);
 
     await contentSpawnMutation(browser, MOVE, function() {
-      document.getElementById("container").setAttribute("aria-owns", "c d");
+      content.document.getElementById("container").setAttribute("aria-owns", "c d");
     });
 
     testChildrenIds(containerAcc, ["a", "b", "c", "d"]);