Chrome users:

You have to visit https://tls.passthepopcorn.me once.

Then you can use tab to search from anywhere by:

1. Start entering passthepopcorn.me to search address bar
2. Press tab when you see passthepopcorn.me
3. Enter the movie title to search the torrents

Firefox users:

The "Add PassThePopcorn" option should be there in the search box.