That's strange Eman
Just tried a ccbill link here and no problems at all.
Checked my FF settings as you describe and that they're at default. That TLS box isn't checked...
Are you perhaps using an older version of FF?
Agreed Jim...using FF did take a bit of getting used to. But, now that I have...I find IE to be a slow, cumbersome pos when I do have to use it (rarely).