Not everything sent in PR is an improvement from everyone pov though. It might be an improvement for the contributor of a new feature they might be the only one to ever use, while it adds maintenance burden for you, more dependencies, risks of bugs etc for the community, which you have to balance somehow. Plus you might have a view on how to do things properly on your project, which needs to be communicated to contributors, which is additional work you might not have time for, especially if this is just some small side project.

One thing that I wonder is if I can convert my old firefox -P profiles into this new kind of profiles, and have them all be synced by firefox with a single account instead of recreating them on all my devices. On the filesystem they seem to be the same, just not in the same place.