diff --git a/src/background/webrequests.ts b/src/background/webrequests.ts
index 169ac11a..0669a6eb 100644
--- a/src/background/webrequests.ts
+++ b/src/background/webrequests.ts
@@ -15,7 +15,7 @@ export const requestEvents = Object.keys(requestEventExpraInfoSpecMap)
 // eslint-disable-next-line @typescript-eslint/ban-types
 export const LISTENERS: Record<string, Record<string, Function>> = {}
 
-export const registerWebRequestAutocmd = (
+export const registerWebRequestAutocmd = async (
     requestEvent: string,
     pattern: string,
     func: string,
@@ -23,8 +23,15 @@ export const registerWebRequestAutocmd = (
     // I'm being lazy - strictly the functions map strings to void | blocking responses
     // eslint-disable-next-line @typescript-eslint/ban-types
     const listener = eval(func) as Function
-    if (!LISTENERS[requestEvent]) LISTENERS[requestEvent] = {}
+
+    if (!(requestEvent in LISTENERS)) {
+        LISTENERS[requestEvent] = {}
+    }
+    if (pattern in LISTENERS[requestEvent]) {
+        await unregisterWebRequestAutocmd(requestEvent, pattern)
+    }
     LISTENERS[requestEvent][pattern] = listener
+
     return browser.webRequest["on" + requestEvent].addListener(
         listener,
         { urls: [pattern] },