Hello, the project is shut down for the time being. Currently I have no time to continue here. Have a look at the forks. Maybe you will find a person who will continue and publish it.
I explicitly allow to republish it. Credits to my original should be self-evident. It is not allowed to monetize it or sell it in any other way. The new code that comes must be open source.
If you want to continue it, please let me know. Then I can link you here.
Directly download from the Firefox Addon-manager: https://addons.mozilla.org/de/firefox/addon/http-header-live/
Directly download from the Chrome Addon-manager: https://chrome.google.com/webstore/detail/http-header-live/jljeikaiehipjcfbpedmgikbbhmknpkk
Google Translator English:
Open the add-on.
Search a page with "POST parameters" for example: https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_form_method_post
Send the page.
In the add-on, click the displayed data.
A new window is opening up.
Edit the data you want and send it.
German:
Öffne das Add-on.
Suche eine Seite mit "POST Parameter" zum beispiel: https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_form_method_post
Sende die Seite ab.
Klicke in dem Add-on auf die angezeigten Daten.
Es öffnet sich ein neues fenster.
Bearbeite die daten die du möchtest und sende sie ab.