[extra88]

Money is fungible, employees are not. Whether others at Mozilla may be tasked with implementing this API or Mozilla (or someone else) contracts Igalia to do it, the employees responsible for and qualified to work on UI are still going to get paid and will still have other work to do.

[slver]

As far as I know Mozilla is not a foundation for charity towards unemployed developers. So their goal is not finding work for their existing employees, their goal is improving the browser in meaningful ways. They're free to lay off and hire people to do this.

Also honestly any developer worth keeping could figure out the task at hand given sufficient time. So to talk about developers as if there's a developer who can only alter the rendering of tabs and what not is kinda silly.