ko bundles are broken - XML Parsing Error

I updated ko v9.0a1 (ESR60) to v9.0a6 (ESR68) and got the following error.

XML Parsing Error: error in processing external entity reference
Location: chrome://browser/content/browser.xul
Line Number 55, Column 1:

%aboutTorDTD;
^

Updating: the browser window is loaded (sans chrome, all white), and after the tor connection is successful, it then puts this error message into the browser window.

So I tried a new install, to see what happens. Looking around, I noticed that the Back button is not translated.

And the same error occurs as the update, but instead of using the browser window (which is not loaded), it flashes a dialog for about 0.1468 seconds.

Pics to follow