I'm happy to leave someone else to do that. I'd rather be in a job I actually enjoy the day-to-day of.
And that's to say nothing of the problems of PhDs: namely that there are ten times more PhD positions than there are postdoc positions. That ten-to-one crunch when it comes to finding a job sure does sound fun...
If you want to contribute to Firefox or any other non-trivial open source project, you need to spend time creating a development environment and it likely will take weeks to months before you can make a substantive contribution.
If anyone is reading the comment I'm responding to or its parent comment, keep in mind that the manual labor is in pursuit of a goal.
Yes, it's all a means to an end, but how much time one wants to spend in the "means" (which can get extremely repetitive, apparently) is what counts for the parent (I'm supposing).