Comment by Suppafly

>So Rust would have been a thing even if Mozilla had focused on their core product.

Plus, while Firefox is their main product, it's been decades since Mozilla has been solely a browser company. It's like saying Microsoft should stop making Office because it detracts from their OS business. Companies can make more than one product. Some of those products are going to have shorter lifespans or smaller userbases than others and that's OK.