Mirador doesn't work after hitting back button

Load a catalog page with the Mirador viewer; click an internal link (e.g., a subject) to navigate away; hit the browser's back button; Mirador does not properly load.

I think it might be a bug in our "window enhancements" plugin (which currently just shows/hides thumbnail navigation depending on the manifest).

This is because turbolinks is not equipped to deal with this scenario. Thus it only occurs when navigating to internal links to other DLG web pages — not to external links, nor to links to non-HTML resources (JSON manifests, etc), nor to links that open in another window.