Help with Setting up proxy

Thanks for the tutorial. But I need one help, for internet I am using my company proxy, and when I changed it to 127.0.0.1:8080, then my internet is not working, could you please facilitate me. Thanks

One will want to verify their local proxy is setup to forward traffic to the company proxy. IE upstream proxy configuration.

I already using proxy from http://advanced.name, and i have the same question. How to configure internet to work with 127.0.0.1:8080? Thank you.

I followed Web-hackers handbook correctly
So I opened burp> settings checked my IP 127 prt 8080
I checked edit in burp, different IP than Burp showed not matching loop, so I changed it 127.0.0.1 loop saved.

go to firefox browser on my virtual box desktop > settings> network> put 127 IP , checked Use this for all protocols box

got the certificate > added …everything worked
until, I closed burp…
my Firefox wont work unless I uncheck the Use this for protocols box. Worse, I open Burp and its back IP 127 but in edit> back to my IP ( I’m assuming)

What did I do wrong?