Version: Nightly 27.0a1 (2013-10-23) Testcase: 1. Copy any number text to the clipboard, like "1234". 2. Right click on the current URL in address bar and then select "Paste & Go". Expected Results: Firefox should navigate to the new URL. Actual Results: The URL changes back to original, and the page doesn't change.

Does the browser console show anything?

Yes, for the above case it is showing a request to http://1234/ and then dropping it, which kind of makes sense (but maybe it should have been best show a server not found kind of screen). But the scenario I am interested in was, suppose my URL bar has https://bugzilla.mozilla.org/show_bug.cgi?id=936873 and I want to goto bug 931234, I would just select "6873" and right click and select "Paste & Go".