I have a router using DD-WRT and it offers HTTPS access to its GUI. However, when trying to use it I get the error page and no way to bypass it (see picture). The "help" page is not helpful. It tells me to "contact the owner" so that they can get their stuff updated (i.e. use updated TLS version). This is not going to happen and I don't have a way to update this myself, AFAIK. This is in a LAN and not being able to bypass this error forces me to use HTTP instead, which is not what I want. I need to know how I can bypass this. I know what I'm doing and I don't need an "explanation" of why Firefox is behaving the way it is right now. What I need is a way to bypass this error message so that I can access my own router over HTTPS instead of HTTP. I'm using Firefox 48.0 in GNU/Linux. Thanks in advance. PS: Firefox really needs to understand that there're some users out there that know what they're doing and should *always* have a way to go to advance settings and add exceptions.