There are halo benefits to the side projects as well. Some experimental or otherwise "daring" functionality in a side project can become invaluable within the b

There are halo benefits to the side projects as well. Some experimental or otherwise "daring" functionality in a side project can become invaluable within the browser core at a future date. It's a bit like an external stimulus triggering a random mutation that proves to be beneficial. Ex: Popup blocking required modification to the browser before it became a vital core feature.