Turn off extensions signatures in Firefox (see comments in the code)

turn-off-signatures.js

// Turn off extensions signatures in Firefox
// Use at your own risk!

// Usage:
// Start browser with rights to write into his install directory (run as administrator)
// devtools.chrome.enabled = true (in about:config)
// Open Scratchpad: Shift+F4 (Tools - Web-Developer - Scratchpad)
// Set: Environment - Browser
// Then paste following code and press Run, browser will be restarted, than enjoy

// Hack: https://forum.mozilla-russia.org/viewtopic.php?pid=720001#p720001
// This code: https://gist.github.com/Infocatcher/26802f739e72cd919ce9aecff0708196

var bak = ".no-signatures.bak";
// Disable signatures
var hackPath = OS.Path.join(OS.Constants.Path.libDir, "no-signatures.js");
var prefPath = OS.Path.join(OS.Constants.Path.libDir, "defaults", "pref", "no-signatures-prefs.js");
var textEncoder = new TextEncoder();
var arr = textEncoder.encode(
`//
try {
	Components.utils.import("resource://gre/modules/addons/XPIProvider.jsm", {})
		.eval("SIGNED_TYPES.clear();");
}
catch(e) {
	Components.utils.reportError(e);
}`
);
OS.File.writeAtomic(hackPath, arr)
	.then(null, Components.utils.reportError);
arr = textEncoder.encode(
`pref("general.config.filename", "no-signatures.js");
pref("general.config.obscure_value", 0);`
);
OS.File.writeAtomic(prefPath, arr)
	.then(null, Components.utils.reportError);
// Turn on already disabled extensions
var dataPath = OS.Path.join(OS.Constants.Path.profileDir, "extensions.json");
OS.File.read(dataPath).then(
	function onSuccess(arr) {
		var data = new TextDecoder().decode(arr);
		var json = JSON.parse(data);
		json.addons.forEach(function(addon) {
			if(!addon.active && addon.appDisabled) {
				addon.appDisabled = false;
				addon.active = !addon.userDisabled;
			}
		});
		var str = JSON.stringify(json);
		arr = textEncoder.encode(str);
		OS.File.writeAtomic(dataPath, arr, { backupTo: dataPath + bak })
			.then(null, Components.utils.reportError);
	},
	Components.utils.reportError
).then(null, Components.utils.reportError);
// Flush cache (will be generated automatically)
var cachePath = OS.Path.join(OS.Constants.Path.profileDir, "extensions.ini");
OS.File.move(cachePath, cachePath + bak);
// Restart
(function quitWithFlags(flags) {
	var cancelQuit = Components.classes["@mozilla.org/supports-PRBool;1"]
		.createInstance(Components.interfaces.nsISupportsPRBool);
	var quitType = flags & Components.interfaces.nsIAppStartup.eRestart ? "restart" : null;
	Services.obs.notifyObservers(cancelQuit, "quit-application-requested", quitType);
	if(cancelQuit.data)
		return false; // somebody canceled our quit request
	var appStartup = Components.classes["@mozilla.org/toolkit/app-startup;1"]
		.getService(Components.interfaces.nsIAppStartup);
	appStartup.quit(flags);
	return true;
})(
	Components.interfaces.nsIAppStartup.eAttemptQuit
	| Components.interfaces.nsIAppStartup.eRestart
);