https://chrome.google.com/webstore/detail/spdy-indicator/mpb...
All this when the code is a one-liner:
chrome.extension.sendRequest({ spdy: window.chrome.loadTimes().wasFetchedViaSpdy });
(Also, wouldn't it be good if the Chrome store had a link to the developer / source? All I could find on there was a username 'rauchg')
https://chrome.google.com/webstore/detail/spdy-indicator/mpb...