I just installed Ubuntu 18.04 and I add Socks of Tor for proxy by network option but it doesn't work It always worked on Ubuntu 16.04 but now it doesn't work thank you.
2 Answers
Firefox has probably its own Network settings - you can check that in Firefox - preferences - Network settings and change the settings if necessary.
The problem was with Firefox, I installed google chrome and it works very well with proxy added in network options, but still I don't know what was the problem with Firefox.