This source (2020) also claims that global Firefox use is about 4% while Edge is under 3%, contradicting the claim (even including non-MacOS devices): https://gs.statcounter.com/
Another 2020 source gives 5.5% to Firefox and 0.5% to Edge on MacOS, also contradicting the claim: https://netmarketshare.com/?options=%7B%22filter%22%3A%7B%22...
Choose your own source:
https://duckduckgo.com/?q=edge+surpasses+firefox
This source (2020) also claims that global Firefox use is about 4% while Edge is under 3%, contradicting the claim (even including non-MacOS devices): https://gs.statcounter.com/
Another 2020 source gives 5.5% to Firefox and 0.5% to Edge on MacOS, also contradicting the claim: https://netmarketshare.com/?options=%7B%22filter%22%3A%7B%22...