The Sauce extension supplements https://strava.com with better cycling and running information. It's a simple, lightweight and open-source!
Chrome/Edge:
https://chrome.google.com/webstore/detail/eigiefcapdcdmncdghkeahgfmnobigha
Firefox:
https://addons.mozilla.org/en-US/firefox/addon/sauce4strava
Safari (MacOS and iOS):
https://apps.apple.com/us/app/sauce-for-strava/id1570922521