httptool

An extension that simply exposes the browser.webRequest APIs.

Editing the script

Once installed, go to about:extensions -> httptool -> Preferences, then edit shit.

Opening a larger (full-screen) editor

Press Alt+Backslash to re-open the editor in a new tab.

Note that if you have multiple editors open, whichever editor makes the most recent change is the one that gets saved.

Applying Changes

Changes are autosaved on edit, however to apply them, you need to disable and re-enable the addon, or restart the browser. This is to prevent us from needing to handle unregistering & re-registering anything.

Icon Source

https://www.deviantart.com/transparentjiggly64/art/Blahaj-facing-sideways-989660804