This problem only occurs in the Page: namespace. Other namespaces are not affected.

Confirming (though I don't even get an image delivered here, which is worse).

Firefox 27 says:
HierarchyRequestError: Node cannot be inserted at the specified point in the hierarchy
in load.php:5779:
append: function() {

		return this.domManip(arguments, true, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 ) {

--> this.appendChild( elem );

			}
		});

},

@Inew: Is this issue fixed for you? If so, please close the bug

Change 115205 had a related patch set uploaded by Tpt:
Fix fatal error when usebetatoolbar option was activated and not showtoolbar

https://gerrit.wikimedia.org/r/115205

@Inew: Forget the previous comment. I've managed to reproduce the issue after reading en.wikisource Scriptorium (the next time please put here too your options or copy/paste a link). I've also made a change that should fix partially the issue.

• Bug 61839 has been marked as a duplicate of this bug. ***

(In reply to Tpt from comment #3)

@Inew: Is this issue fixed for you? If so, please close the bug

Nothing changed. If you implemented a fix, it didn't work.

Change 115205 merged by jenkins-bot:
Fix fatal error when usebetatoolbar option was activated and not showtoolbar

https://gerrit.wikimedia.org/r/115205

Patch merged in comment 8 which partially fixes the issue => resetting status