HTTP Header Spy by Michiel Roos

4.8 Stars out of 5

4 reviews

Rated 5 out of 5
by geeknik, a year ago
Rated 5 out of 5
by Firefox user 17501118, 3 years ago
Rated 5 out of 5
by maedox, 5 years ago
Rated 5 out of 5
by -= Cara =-, 5 years ago
Very convenient, just what you need!
For information: sometimes have to disable it - POST requests do not pass (for example, in the Yandex account). But this does not detract! :)