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In SP12, if you are on a page and you click a slow-to-respond link, click on a bookmark in the favorites bar, or type in a new URL in the location bar and hit enter and it takes a while to load the page:

When you click the stop button, instead of staying on the page that's still being displayed, the page goes white.

Once this happens, (I've tested this), if you hit the stop button before any data has come back from the requested page and then hit refresh, it refreshes to about:blank instead of the new URL, and the back button then takes you back to the original page you were on, losing the new URL in the location bar. If any of the content from the new page has loaded (even only a few bytes), the new location stays in the location bar, but hitting refresh does reload the new page that was attempting to load.