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For additional reference, here is a list of known applications which save account credentials in browser cache.
Fitbit
Garmin
Jawbone
Lumo
Mapmy
Misfit
Movable
Strava
Under Armour
Vitadock
Withings/Nokia
For additional reference, you may also take a look at another article link below specific to Under Armour:
https://support.validic.com/customer/portal/articles/2318305-mapmyfitness-and-under-armour-record-connection-behavior