Mozilla Firefox will not open websites for gooutdoors, millets or blacks, or any linked to the 'blacks' group. Their website addresses are all different but there is clearly some association with the group. No messages, just a blank screen as though continually waiting. Used to be ok but this issue has been consistent for at least the last two weeks, and there have been no changes to equipment or software in that time. Have cleared cache and cookies, and restarted the router but makes no difference. These websites open ok on my phone, which uses google chrome, so specific to firefox. I use norton 360 on both pc and phone and have done for last couple of years with no issue. Previous post from around 3 years ago show this issue has occurred for other people in the past and no solution provided, where some reported the problem evewntually disappeared on its own with no explanation, but don't think it lasted this long. Help please.