diff --git a/mozilla/gfx/src/nsDeviceContext.cpp b/mozilla/gfx/src/nsDeviceContext.cpp
index 842e460b8eb..0ac3a68212b 100644
--- a/mozilla/gfx/src/nsDeviceContext.cpp
+++ b/mozilla/gfx/src/nsDeviceContext.cpp
@@ -563,6 +563,14 @@ NS_IMETHODIMP DeviceContextImpl::GetLocalFontName(const nsString& aFaceName, nsS
   return result;
 }
 
+NS_IMETHODIMP DeviceContextImpl :: FlushFontCache(void)
+{
+  if (nsnull != mFontCache)
+    mFontCache->Flush();
+
+  return NS_OK;
+}
+
 NS_IMETHODIMP DeviceContextImpl::GetILColorSpace(IL_ColorSpace*& aColorSpace)
 {
   if (nsnull == mColorSpace) {
diff --git a/mozilla/gfx/src/nsDeviceContext.h b/mozilla/gfx/src/nsDeviceContext.h
index 53ff4c15b07..97f01958b35 100644
--- a/mozilla/gfx/src/nsDeviceContext.h
+++ b/mozilla/gfx/src/nsDeviceContext.h
@@ -68,6 +68,8 @@ public:
   NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
                               PRBool& aAliased);
 
+  NS_IMETHOD FlushFontCache(void);
+
   NS_IMETHOD GetDepth(PRUint32& aDepth);
 
   NS_IMETHOD GetILColorSpace(IL_ColorSpace*& aColorSpace);
diff --git a/mozilla/gfx/src/nsIDeviceContext.h b/mozilla/gfx/src/nsIDeviceContext.h
index 41f244a3136..a69dea633e5 100644
--- a/mozilla/gfx/src/nsIDeviceContext.h
+++ b/mozilla/gfx/src/nsIDeviceContext.h
@@ -235,6 +235,13 @@ public:
   NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
                               PRBool& aAliased) = 0;
 
+  /**
+   * Attempt to free up resoruces by flushing out any fonts no longer
+   * referenced by anything other than the font cache itself.
+   * @return error status
+   */
+  NS_IMETHOD FlushFontCache(void) = 0;
+
   /**
    * Return the bit depth of the device.
    */