> They always have the nuclear option of forking and making those fields no longer internal. while that is always possible, it is not always reasonable. If yo

> They always have the nuclear option of forking and making those fields no longer internal. while that is always possible, it is not always reasonable. If you take firefox as the example, the removal of the XUL extension api is one such. And while there's many a forks to keep the old XUL api, none of them really caught on, and so support for them such as maintaining security patches etc fails.