I should never have updated firefox.... as soon as firefox update completed my computer screen turned black and re-activated with everything small in size. It's not only the browser, icons and menu text that has shrunk. It's all the default system fonts and features too including the settings windows, taskbar and fonts in the whole system that are now tiny - half the size it was before the update. I've manually adjusted the web font size by ctrl++ but that doesn't change everything else that is now much smaller in size.

It's extremely annoying and I want this sorted out.