No, the discovery of seafloor spreading eventually led to the replacement of the theory of continental drift with the modern theory of plate tectonics. Originally, Alfred Wegener proposed in the early 20th century that all the continents were once assembled in a supercontinent called "Pangea" and had gradually rearranged themselves to their current positions. However, Wegener's theory lacked a convincing mechanism for how these large landmasses moved across the ocean floor.

The theory of plate tectonics, which emerged in the 1960s, provided the explanation that Wegener's theory needed. It showed that the Earth's rigid lithosphere (comprised of the crust and the upper mantle) is broken into several tectonic plates that move around on the underlying asthenosphere, a weaker layer of the mantle. The movement of these plates is driven by various forces, including convection currents within the Earth's mantle.

The process of seafloor spreading, where new oceanic crust forms at mid-ocean ridges and gradually moves away from the ridge crest, is a fundamental aspect of plate tectonics. As plates spread apart, new oceanic crust is formed, and the older crust is subducted at convergent plate boundaries. This continuous recycling of the oceanic crust provided the mechanism that explained how continents could drift apart over time.

Therefore, while seafloor spreading played a crucial role in the development and acceptance of the theory of plate tectonics, it did not prove the theory of continental drift. Instead, it contributed to a more comprehensive understanding of the mechanisms behind Earth's dynamic processes and replaced the theory of continental drift with the modern theory of plate tectonics.