

I would imagine since Firefox is licensed with Mozilla Public License (MPL), that they would be able to continue using the source code and adding additional features and other improvements (as long as they follow the MPL). However, since the base code itself would no longer be getting updates, anyone wanting to continue with a fork would have to fix any bugs and security issues that may be discovered going forward.
Great point! Also, keeping things updated to ensure support with all the other libraries and APIs it may use, supporting new operating systems…