Blink is also open and free enough. The wide usage of it, and the manifold companies pushing successfully against Google, is proof enough. Firefox on the other side is not free from hostile behavior itself. The manifold bullshit that Mozilla did over the years telling.
And in general, your requirement is not matching the demand of the majority of users. I don't give a f** if something is open or liberated, I'm a user, I care firstly whether it's doing what I need, and being open&free are just tools to balance the powerplay of the creators.
But if not enough people are using the browser, they have no power anyway. And if there is only one developer, then we as the users have not way to balance our power against them. Mozilla has shown over the last decade that the user has no power in their game, which shows that free and open software in itself has little meaning.
The multiple blink-browsers are showing better how this is supposed to work, then the one project who always claims this as one of their main goals.