i'm not sure how to repro this, but sometimes devtools gets into a state where search never finishes. it's not that it just takes a long time -- after restarting the browser usually the same search takes a second or less. the progress bar gets to about half way and then just stops. it's still in searching mode, the 'stop' button next to the progress bar doesn't work, and it's impossible to start another search. i can't be sure, but it seems like it happens more when stopped at a breakpoint, especially during onreadystatechange. closing and reopening devtools sometimes fixes it, sometimes causes the browser to hang.