1. Let Thunderbird display a message. 2. Hit Ctrl+U. 3. Click File > Save Page As and save the message. Results: The saving dialog doesn't succeed and stays open. The js console displays: Error: uncaught exception: [Exception... "Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsITransfer.init]" nsresult: "0x80004002 (NS_NOINTERFACE)" location: "JS frame :: chrome://communicator/content/contentAreaUtils.js :: internalSave :: line 376" data: no] This is unrelated to bug 222157: It doesn't work without those changes either; on the contrary, bug 222157 was supposed to make Save Page As work again by referencing XPCNativeWrapper.js in viewSource.xul: http://bonsai.mozilla.org/cvsview2.cgi?diff_mode=context&whitespace_mode=show&subdir=mozilla/toolkit/components/viewsource/content&command=DIFF_FRAMESET&file=viewSource.xul&rev1=1.18&rev2=1.19&root=/cvsroot

please don't assign random bugs to me that said, may well have the same cause as Bug 287490

Sorry, I should've cc'ed you instead. Since ViewSource-SaveAs uses the progress dialog as well, and the error is displayed in the js console, this looks indeed like a dupe of bug 287490. *** This bug has been marked as a duplicate of 287490 ***