Which extension for Firefox should be used so that only sites that fall under the mask go through the proxy?

Question

proxy

In general, the subject,
You need a small extension, to which you set proxy settings and a list of sites / rules that need to be proxyed, all other requests that do not fall under the rules should go directly.
Proxy - SOCKS 5 with authorization.

Answer 1

No extension is required for this:
https://developer.mozilla.org/en-US/docs/Web/HTTP/...
https://help.zscaler.com/zia/configuring-mozilla-f...