I am very disappointed by most comments here. Firefox is not a simple product. Mozilla funded Rust because it could help their other products (specifically Fire

I am very disappointed by most comments here. Firefox is not a simple product. Mozilla funded Rust because it could help their other products (specifically Firefox). Mozilla has, depending how you count, 4 engines to support for all their target platforms. They have a bunch of frameworks to deal with networking, layouts and JS. They maintain the second most used repository of Root CA. And all those projects all work towards the betterment of the browser, Firefox. If people think that MS with all their resources decided to use Chrome because it was cheaper, you will be missing the full picture: browsers are very complex beast that have to deal with swats of devices, platforms, interactive code, and all of that while being the biggest surface of attack for all your users. That's not easy, nor cheap.