Yet another good reason to make sure you're opted out of all Firefox 'studies' and 'experiments' or whatever they're calling them today.
They are not getting better as a company. Somehow these weird, anti-user things just keep happening. Because they're the 'future' apparently.
This is only the future if we continue to tolerate it.
https://testpilot.firefox.com/experiments/advance
https://www.ghacks.net/2018/08/07/firefox-experiment-recommends-articles-based-on-your-browsing/