I have released a new version on Github and also live on the website. This new version has improvements to the queue system so it doesn't fail as it used to.
There is now a tokening system for the queue. When you submit a lookup request you will receive a token. You can then leave the page and browse as you wish. You can return later and enter the token to see your results. The only caveat is that results are kept for only 24 hours after the request was submitted.