I have done all of the above and I only use firefox.
The problem is most infuriating as it allows me to logon but I cannot go to the position screen without throwing up the banning message. I can go to forums and read the first page of a posting but when I try to look at other pages of a post it throws up a banning. I can look at cities but when I select stats of a city it throws up the ban warning.
It seem to happen irrespective of if I use tabs or only have one tab open in firefox.
I would report it in the bug base but it throws the banned warning every time I try to access that forum. That kind of makes it impossible for me to do so.
btw...there is some consistency in the bug. I can for eg look at my own personal ships inventory but when I try to look at a specific ship's stats I get the banning. Same applies for Vehicles, npcs and droids.
This also applies for both faction and personal inventories