I thought I'd add my experience:

* Opened page in new tab, switched to tab after reading a few other things.

* Saw a url in the drop-down at the top, different to url of page, briefly pondered whether I should go to that instead.

* Decided to copy/paste and go there.

* Couldn't type in editor, closed tab thinking it didn't work in Chrome on OSX.

Now it's a holiday in the UK, and sunny too amazingly, so I'm just quickly flicking through items of interest but people generally don't read what you put in front of them. I've read through the comments now and, while one anecdote isn't data, you may want to think about how you present the write-version/read-only-version URLs.