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Seismic Shaker 220.127.116.11-signed.1-signed No Restart
Seismic Shaker rattles your browser window whenever a strong earthquake occurs near you.
About this Add-on
This add-on hourly checks the U.S. Geological Survey's feed of recent M 2.5+ earthquakes and shakes your active browser window should an earthquake happen anywhere within 500km of your current location.
Also included are a simulation feature and a link to earthquake tips.