That is because Mozilla has consistently moved Firefox in the direction of a Chrome clone.
When Firefox started is was not a copy of existing browsers. There is no reason it would have to be now. But they have rejected their core users. So now the only option left is a Chrome clone because that is what people are used to.
When Firefox started is was not a copy of existing browsers. There is no reason it would have to be now. But they have rejected their core users. So now the only option left is a Chrome clone because that is what people are used to.