Comment 3 for bug 1861913

This just happened again (on 73.0+build3-0ubuntu1) and I've noticed that the issue appears to apply _per window_. So if I launch Firefox and this is happening, then I can open a new window and, provided I don't open any websites, the menus function correctly (to allow me to disable Strict tracking protection). Once disabled, tabs within the first window still fail to display content (until the browser is restarted), but tabs within a new window work as expected (without a restart).