緊急地震速報 by Extension is a Chrome add-on developed by justoneplanet. This add-on utilizes Twitter to provide real-time earthquake alerts. It has been offered for free using the servers of "Minna no Kaomoji Jiten" and "flick" since shortly after the 2011 Tohoku earthquake and tsunami. However, due to significant changes in the Twitter API, the developer has decided to discontinue the service as it is no longer feasible to provide stable service.

It is important to note that this extension uses an API to deliver real-time information from Twitter, which may not be as reliable or timely as television or radio broadcasts. It is recommended to use this extension as a supplementary source of information.

Please be aware that if you encounter frequent display issues, you can click on the wrench icon in the popup window's upper right corner to dismiss the display.

Thank you for using 緊急地震速報 by Extension for the past 12 years.