I will ask questions using a translator because I can't speak English before asking. https://support.mozilla.org/ko/kb/connection-settings-firefox First of all, I'm a Linuxmint user. The image of the link above shows the SSL proxy in the manual proxy settings following the HTTP proxy. However, Firefox does not have an SSL proxy, making it impossible to type at all. I'm curious about the solution. I checked it after updating it to the latest version for fear of possible problems with the update, but it was still causing problems. ''duplicate. https://support.mozilla.org/en-US/questions/1296098''