It goes well beyond Opera and Edge. Looking at the netmarketshare stats for August there are 14 browsers which use the blink engine and have a reported market

It goes well beyond Opera and Edge. Looking at the netmarketshare stats for August there are 14 browsers which use the blink engine and have a reported market share. Brave is not on the list since it currently reports itself as Chrome. 2 of those browsers have a market share higher than Firefox, Microsoft Edge and Samsung Internet Browser. Samsung Internet Browser is a mobile only browser which ships on Samsung phones and tablets. Removing those and Chrome the remaining 9 blink based browsers combined still have a higher market share than Firefox.