User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9b4) Gecko/2008030317 Firefox/3.0b4 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9b4) Gecko/2008030317 Firefox/3.0b4 When typing into the search bar, open a new window. Close that new window and return to the search bar. Pressing enter fails to initiate search. Reproducible: Always Steps to Reproduce: 1.Open Firefox and enter search bar. 2.Start typing into search bar 3.Open a new window, either using Crtl+N or File>>New Window 4.Close the New Window, pressing Crtl+W/Alt-F4/Click Close 5.Return to the search bar, without clicking outside/deselecting typed text, and press [Enter] or type more text and press [Enter] and the search does not initiate. Actual Results: Search does not initiate when pressing enter, does work when clicking outside the search box and reselecting box or by clicking search button. Expected Results: Search initiates when pressing enter. Default theme used.

This regressed in May or June 2006. The STR caused a crash in those days.

Sounds like the same bug as bug 413836.