Not being able to easily add or remove code is good from a security standpoint though. I would take a bugfix only, stable-API NSS over anything that is in constant flux. So it's not how fast you can add features that should be in focus for a mature product - it's how safely you can add bug-fixes, including security fixes. Unless you are saying you have a security fix lingering for 3-4 years, I think Mozilla is doing it right.
Edit: Not to ignore the valid point - having a designated code owner that responds would of course be good.
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Not being able to easily add or remove code is good from a security standpoint though. I would take a bugfix only, stable-API NSS over anything that is in constant flux. So it's not how fast you can add features that should be in focus for a mature product - it's how safely you can add bug-fixes, including security fixes. Unless you are saying you have a security fix lingering for 3-4 years, I think Mozilla is doing it right.
Edit: Not to ignore the valid point - having a designated code owner that responds would of course be good.