To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Seismic Shaker 188.8.131.52-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.