The GPX that I am downloading with this does not include timestamps, only the lat/lng points. If users want timestamps in their file this addon contains them.

Export gpx-track from strava.com by Qavai

Would rate it 4,5 stars but since we cannot attribute half stars here I'm taking away -1,5 star because this addon kind of breaks Strava, when analyzing my power curve I can no longer see selected time, and when I'm creating a segment or shortening my activity, the map got incredibly small and is no longer taking the width of my monitor. Another thing that's bothering me is when I'm in the analyze tab, graphs and profiles got so rescaled that I can barelly see the map. Other than that it's really an addon that I was looking for!
Just wish we could see Positive Gradient, say you're climbing 2km & 100m (5%), descending 2km & 100m (-5%) and climbing 1km 100m (10%), we have a total climb of 200 meters for a total distance of 5 km, which translates to 4 positive percents. It's like +climb but with +%