I have been using Firefox in Ubuntu for many years.And I use Royalmail a lot to send parcels and I always use their tracking without any problem.Until about 2 months ago when tracking became impossible.I can do anything else on their website without any problem.In Firefox settings on Privacy I always use private mode and I could still track my parcels.Now I can't.Even untick private mode does not make any difference. I tried Royalmail tracking on my mobile chrome and it works but does not work on Firefox.I have use Firefox for years and I thought there was something wrong with Royalmail tracking until I tried it on Chrome.Then it must be a Firefox problem. Thanks for any help