Comment 90 for bug 240242

I also have this problem from time to time (sometimes going days without encountering it and sometimes having it happen within minutes of the last occurrence.) Opening a new window fixes the problem (at least temporarily) but the address bar will not work properly (ie cannot hit enter or the open url button) in any tab within the effected window.
I too had 2.0.72 of the delicious extension. I could try disabling it, but since the bug crops up at such seemingly random intervals (usually it's at least a few hours after starting FF, but this morning it happened immediately after starting FF, ie I couldn't open any URL's from the address bar after the FF startpage came up) that it would take me days of using it before I could say for sure that that had fixed the problem, and I'd rather not operate for several days without delicious.