diff --git a/browser/base/content/test/general/browser_bug537013.js b/browser/base/content/test/general/browser_bug537013.js
index 4f8d0be67977..34e6dfbf8b00 100644
--- a/browser/base/content/test/general/browser_bug537013.js
+++ b/browser/base/content/test/general/browser_bug537013.js
@@ -11,6 +11,9 @@ let texts = [
   "To err is human; to forgive is not company policy."
 ];
 
+let Clipboard = Cc["@mozilla.org/widget/clipboard;1"].getService(Ci.nsIClipboard);
+let HasFindClipboard = Clipboard.supportsFindClipboard();
+
 function addTabWithText(aText, aCallback) {
   let newTab = gBrowser.addTab("data:text/html,<h1 id='h1'>" + aText + "</h1>");
   tabs.push(newTab);
@@ -19,6 +22,7 @@ function addTabWithText(aText, aCallback) {
 
 function setFindString(aString) {
   gFindBar.open();
+  gFindBar._findField.focus();
   gFindBar._findField.select();
   EventUtils.sendString(aString);
   is(gFindBar._findField.value, aString, "Set the field correctly!");
@@ -61,7 +65,9 @@ function continueTests1() {
   // Confirm the first tab is still correct, ensure re-hiding works as expected
   gBrowser.selectedTab = tabs[0];
   ok(!gFindBar.hidden, "First tab shows find bar!");
-  is(gFindBar._findField.value, texts[0], "First tab persists find value!");
+  // When the Find Clipboard is supported, this test not relevant.
+  if (!HasFindClipboard)
+    is(gFindBar._findField.value, texts[0], "First tab persists find value!");
   ok(gFindBar.getElement("highlight").checked,
      "Highlight button state persists!");
 
@@ -94,8 +100,11 @@ function continueTests2() {
   ok(gFindBar.hidden, "Fourth tab doesn't show find bar!");
   is(gFindBar, gBrowser.getFindBar(), "Find bar is right one!");
   gFindBar.open();
-  is(gFindBar._findField.value, texts[1],
-     "Fourth tab has second tab's find value!");
+  // Disabled the following assertion due to intermittent failure on OSX 10.6 Debug.
+  if (!HasFindClipboard) {
+    is(gFindBar._findField.value, texts[1],
+       "Fourth tab has second tab's find value!");
+  }
 
   newWindow = gBrowser.replaceTabWithWindow(tabs.pop());
   whenDelayedStartupFinished(newWindow, checkNewWindow);
@@ -104,8 +113,11 @@ function continueTests2() {
 // Test that findbar gets restored when a tab is moved to a new window.
 function checkNewWindow() {
   ok(!newWindow.gFindBar.hidden, "New window shows find bar!");
-  is(newWindow.gFindBar._findField.value, texts[1],
-     "New window find bar has correct find value!");
+  // Disabled the following assertion due to intermittent failure on OSX 10.6 Debug.
+  if (!HasFindClipboard) {
+    is(newWindow.gFindBar._findField.value, texts[1],
+       "New window find bar has correct find value!");
+  }
   ok(!newWindow.gFindBar.getElement("find-next").disabled,
      "New window findbar has enabled buttons!");
   newWindow.close();
diff --git a/browser/base/content/test/general/browser_bug567306.js b/browser/base/content/test/general/browser_bug567306.js
index 1fa35efa8511..f3507f66eea2 100644
--- a/browser/base/content/test/general/browser_bug567306.js
+++ b/browser/base/content/test/general/browser_bug567306.js
@@ -2,7 +2,10 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-let Ci = Components.interfaces;
+const {Ci: interfaces, Cc: classes} = Components;
+
+let Clipboard = Cc["@mozilla.org/widget/clipboard;1"].getService(Ci.nsIClipboard);
+let HasFindClipboard = Clipboard.supportsFindClipboard();
 
 function test() {
   waitForExplicitFinish();
@@ -37,7 +40,10 @@ function onFocus(win) {
   let findBar = win.gFindBar;
   selectText(win.content);
   findBar.onFindCommand();
-  is(findBar._findField.value, "Select Me", "Findbar is initialized with selection");
+  // When the OS supports the Find Clipboard (OSX), the find field value is
+  // persisted across Fx sessions, thus not useful to test.
+  if (!HasFindClipboard)
+    is(findBar._findField.value, "Select Me", "Findbar is initialized with selection");
   findBar.close();
   win.close();
   finish();
diff --git a/toolkit/content/tests/chrome/bug409624_window.xul b/toolkit/content/tests/chrome/bug409624_window.xul
index d4bb387dde83..fe9948936f71 100644
--- a/toolkit/content/tests/chrome/bug409624_window.xul
+++ b/toolkit/content/tests/chrome/bug409624_window.xul
@@ -58,6 +58,7 @@
 
       // Simulate typical input
       textbox.focus();
+      gFindBar.clear();
       sendChar("m");
       ok(gFindBar.canClear, "canClear property true after input");
       let preSelection = gBrowser.contentWindow.getSelection();
diff --git a/toolkit/content/tests/chrome/findbar_window.xul b/toolkit/content/tests/chrome/findbar_window.xul
index 38a7f01acf5b..4deffe02318e 100644
--- a/toolkit/content/tests/chrome/findbar_window.xul
+++ b/toolkit/content/tests/chrome/findbar_window.xul
@@ -30,6 +30,9 @@
     var gFindBar = null;
     var gBrowser;
 
+    var gClipboard = Cc["@mozilla.org/widget/clipboard;1"].getService(Ci.nsIClipboard);
+    var gHasFindClipboard = gClipboard.supportsFindClipboard();
+
     var gStatusText;
     var gXULBrowserWindow = {
       QueryInterface: function(aIID) {
@@ -97,7 +100,8 @@
       testFindbarSelection();
       testDrop();
       testQuickFindLink();
-      testStatusText();
+      if (gHasFindClipboard)
+        testStatusText();
       testQuickFindClose();
     }
 
@@ -107,8 +111,11 @@
         ok(!gFindBar.hidden, "testFindbarSelection: failed to open findbar: " + aTestName);
         ok(document.commandDispatcher.focusedElement == gFindBar._findField.inputField,
            "testFindbarSelection: find field is not focused: " + aTestName);
-        ok(gFindBar._findField.value == aExpSelection,
-           "Incorrect selection in testFindbarSelection: "  + aTestName + ". Selection: " + gFindBar._findField.value);
+        if (!gHasFindClipboard) {
+          ok(gFindBar._findField.value == aExpSelection,
+             "Incorrect selection in testFindbarSelection: "  + aTestName +
+             ". Selection: " + gFindBar._findField.value);
+        }
 
         // Clear the value, close the findbar
         gFindBar._findField.value = "";
@@ -188,6 +195,7 @@
       enterStringIntoFindField(searchStr);
       ok(gBrowser.contentWindow.getSelection().toString().toLowerCase() == searchStr,
          "testNormalFind: failed to find '" + searchStr + "'");
+      testClipboardSearchString(gBrowser.contentWindow.getSelection().toString());
 
       if (!matchCaseCheckbox.hidden) {
         matchCaseCheckbox.click();
@@ -246,6 +254,7 @@
 
       ok(gBrowser.contentWindow.getSelection().toString().toLowerCase() == searchStr,
          "testNormalFindWithComposition: text should be found after committing composition");
+      testClipboardSearchString(gBrowser.contentWindow.getSelection().toString());
 
       if (clicked) {
         matchCaseCheckbox.click();
@@ -305,6 +314,7 @@
       enterStringIntoFindField(searchStr);
       ok(gBrowser.contentWindow.getSelection() == searchStr,
           "testQuickFindLink: failed to find sample link");
+      testClipboardSearchString(searchStr);
     }
 
     // See bug 963925 for more details on this test.
@@ -321,7 +331,7 @@
       let a = gFindBar._findField.value;
       let b = gFindBar._browser.finder._fastFind.searchString;
       let c = gFindBar._browser.finder.searchString;
-      ok(a == b && b == c, "testFindWithHighlight: " + a + ", " + b + ", " + c + ".");
+      ok(a == b && b == c, "testFindWithHighlight 1: " + a + ", " + b + ", " + c + ".");
 
       let oldGetInitialSelection = gFindBar._getInitialSelection;
       let searchStr = "t";
@@ -332,22 +342,25 @@
       a = gFindBar._findField.value;
       b = gFindBar._browser.finder._fastFind.searchString;
       c = gFindBar._browser.finder.searchString;
-      ok(a == searchStr && b == c, "testFindWithHighlight: " + a + ", " + b + ", " + c + ".");
+      ok(a == searchStr && b == c, "testFindWithHighlight 2: " + searchStr +
+         ", " + a + ", " + b + ", " + c + ".");
 
       let highlightButton = gFindBar.getElement("highlight");
       highlightButton.click();
-      ok(highlightButton.checked, "testFindWithHighlight: Highlight All should be checked.");
+      ok(highlightButton.checked, "testFindWithHighlight 3: Highlight All should be checked.");
 
-      a = gFindBar._findField.value;
-      b = gFindBar._browser.finder._fastFind.searchString;
-      c = gFindBar._browser.finder.searchString;
-      ok(a == searchStr && b == c, "testFindWithHighlight: " + a + ", " + b + ", " + c + ".");
+      if (!gHasFindClipboard) {
+        a = gFindBar._findField.value;
+        b = gFindBar._browser.finder._fastFind.searchString;
+        c = gFindBar._browser.finder.searchString;
+        ok(a == searchStr && b == c, "testFindWithHighlight 4: " + a + ", " + b + ", " + c + ".");
+      }
 
       gFindBar.onFindAgainCommand();
       a = gFindBar._findField.value;
       b = gFindBar._browser.finder._fastFind.searchString;
       c = gFindBar._browser.finder.searchString;
-      ok(a == b && b == c, "testFindWithHighlight: " + a + ", " + b + ", " + c + ".");
+      ok(a == b && b == c, "testFindWithHighlight 5: " + a + ", " + b + ", " + c + ".");
 
       highlightButton.click();
       ok(!highlightButton.checked, "testFindWithHighlight: Highlight All should be unchecked.");
@@ -368,6 +381,19 @@
       enterStringIntoFindField(SEARCH_TEXT);
       ok(gBrowser.contentWindow.getSelection() == SEARCH_TEXT,
          "testQuickFindText: failed to find '" + SEARCH_TEXT + "'");
+      testClipboardSearchString(SEARCH_TEXT);
+    }
+
+    function testClipboardSearchString(aExpected) {
+      if (!gHasFindClipboard)
+        return;
+
+      if (!aExpected)
+        aExpected = "";
+      var searchStr = gFindBar.browser.finder.clipboardSearchString;
+      ok(searchStr.toLowerCase() == aExpected.toLowerCase(),
+        "testClipboardSearchString: search string not set to '" + aExpected +
+        "', instead found '" + searchStr + "'");
     }
   ]]></script>