So even if I tried to donate, Firefox would black it anyway ?
Firefox and most recently updated browsers will either block you or will force you to manually override the security measure to proceed. You can in fact tell Firefox to proceed anyway (it’s under the Advanced button that pops up in the warning dialog) but that’s not a good idea. Conceptually, you would only be slightly less secure if you wrote your credit card and personal information on the outside of a package and sent it through the US Postal Service to a public mail room.