A Jupyter Notebook that I already had up, stopped being able load following a forced FireFox restart following an update. I closed the server and tried again. I can load the main Jupyter directory page, but when I launch the notebook, the tab opens, but the Jupyter window frame remains empty. I can open this notebook under Chrome and have switched to Chrome for now. The notebook is pretty basic and is not doing anything fancy with graphics or anything like that. The imports are:

import sys, io import math import matplotlib.pyplot as plt import numpy as np import pandas as pd from scipy.optimize import nnls from fractions import Fraction