--- a/modules/plugin/base/public/nsIPluginTag.idl
+++ b/modules/plugin/base/public/nsIPluginTag.idl
@@ -33,18 +33,19 @@
  * and other provisions required by the GPL or the LGPL. If you do not delete
  * the provisions above, a recipient may use your version of this file under
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "nsISupports.idl"
 
-[scriptable, uuid(13a1b39e-72e5-442d-aa73-5905ffaf837b)]
+[scriptable, uuid(88e03453-a773-47ba-9d84-14f672ac99e2)]
 interface nsIPluginTag : nsISupports
 {
   readonly attribute AUTF8String description;
   readonly attribute AUTF8String filename;
+  readonly attribute AUTF8String fullpath;
   readonly attribute AUTF8String version;
   readonly attribute AUTF8String name;
            attribute boolean  disabled;
            attribute boolean  blocklisted;
 };

--- a/modules/plugin/base/src/nsPluginTags.cpp
+++ b/modules/plugin/base/src/nsPluginTags.cpp
@@ -343,16 +343,23 @@ nsPluginTag::GetDescription(nsACString& 
 NS_IMETHODIMP
 nsPluginTag::GetFilename(nsACString& aFileName)
 {
   aFileName = mFileName;
   return NS_OK;
 }
 
 NS_IMETHODIMP
+nsPluginTag::GetFullpath(nsACString& aFullPath)
+{
+  aFullPath = mFullPath;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
 nsPluginTag::GetVersion(nsACString& aVersion)
 {
   aVersion = mVersion;
   return NS_OK;
 }
 
 NS_IMETHODIMP
 nsPluginTag::GetName(nsACString& aName)