@Override
	public void projectClosed(Project project) {
		removeAllFileSystemBrowsers();
		if (FileSystemService.isInitialized()) {
			fsService().closeUnusedFileSystems();
		}
		ProjectIndexService.projectClosed(project);
	}
For testing access only.

@param fsFSRL {@link FSRLRoot} of browser component to fetch.
@return provider or null if not found.
Ghidra/Features/Base/src/main/java/ghidra/plugins/fsbrowser/FileSystemBrowserPlugin.java