when did this happen ??

This is awfull

Pocket is a web-based service for keeping track of things you want to read later. It's similar to bookmarks, but can capture content in richer detail. I'm not sure how it got triggered by exercising.

Is this a popup you can close by using one of the following:

• tap the Esc key
• press Ctrl+w (close tab shortcut)

Pocket is a good product. I used to use it regularly, but no longer prefer it. Firefox should get it out of my face. Whenever I update Firefox, it promotes Pocket. I count of Firefox's integrity. This makes me doubt it.