prevent possible double faking

lib/intercept.js

@@ -159,6 +159,7 @@
 		}
 	};
 
+	let extensionID = browser.extension.getURL("");
 	scope.intercept = function intercept({subject: window}, {check, checkStack, ask, notify, prefs}){
 		var siteStatus = check({url: getURL(window)});
 		logging.verbose("status for page", window, siteStatus);
@@ -189,6 +190,15 @@
 											return undef;
 										}
 										var error = new Error();
+										try {
+											// return original if the extension itself requested the function
+											if (error.stack.split("\n", 3)[1].split("@", 2)[1].startsWith(extensionID)){
+												return original;
+											}
+										}
+										catch (e) {
+											// stack had an unknown form
+										}
 										if (checkStack(error.stack)){
 											return original;
 										}

releaseNotes.txt

@@ -6,7 +6,7 @@ Version 0.4.5:
 		-
 	
 	fixes:
-		-
+		- prevent possible double faking
 
 Version 0.4.4b:
 	known issues: