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Marathon Countdown Timer
Extension information
v1.101
Jun 19, 2018
V2 / V3 are the extension’s Manifest formatMV2Manifest V2 The old extension format. Turned off by default from Chrome 129 and refused from Chrome 137.Manifest V2 vs V3 compatibility guide
Marathon Countdown Timer
Select your race and stay motivated all the way to race day.
Share a photo with the countdown. Download or we can text the photo to you.
