How to block a URL in Firefox's network monitor

Question

I'm trying to block a specific script in firefox from loading locally.

Two days ago, it worked from the developer tools as shown here.

However, I've been struggling to get it to work today, deleted firefox, cleaned user profile, everything, but I can't just see the Block URL:

Am I missing something? Has someone faced the same issue?

Firefox: 67, Mac OS: 10.14.3.

Ps:

I could use third-party tools, which I have to manually select or input a link to block some script ( I have not found any working for me)

I use chrome every day, and it can be done in chrome as seen here

Answer 1

It seems that this is a new feature in Firefox 68, which is currently in beta testing.

• https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/68
• https://bugzilla.mozilla.org/show_bug.cgi?id=1151368

To do that in v67.x (the current version) and previous versions, I would use uBlock Origin or Adblock Plus for that.