constructor(session_id) {
		this.id = session_id;

		file_name = `[Loading ${this.id}]`;
		update_title();
		this.start();

		this._previous_uri = "";
		this._ignore_session_update = false;
		this._poll_tid = -1;
		this._poll_fetch_start_time = -1;
		this._last_write_time = -1;
	}
fb_root is the root reference for the Firebase Realtime Database
@memberof FirebaseSession
@type {any} - @TODO: install types for Firebase or ditch Firebase