Some sites won't open in Firefox. I'm using Tor with Firefox which I tunnel through system network in Ubuntu. After trying to install XAMPP and WordPress locally, it is not working like it always was. I check this check.torproject.org but it says I'm connected.
I think you are talking about
torify command. If so, Try to install FoxyProxy Extension for Firefox.
I used this command a couple of times and my Firefox got weird. After a lot of searching, still I don't know why this happens but foxyproxy is working for me.