every time someone uses electron they buy into the chrome ecosystem -- when they run into problems they write mailing list posts or stack overflow questions that other people can read to help them when they have the same problem, and if they actually want to contribute bugfixes or features upstream they go into chrome not firefox. also if they have a webapp version the webapp version that's running in chrome works exactly the same as the same code running in electron without really having to do any separate testing so which browser are they going to push to be used internally?