diff --git a/ext/src/main.ts b/ext/src/main.ts
index e45fb3c..fb1e5fb 100755
--- a/ext/src/main.ts
+++ b/ext/src/main.ts
@@ -66,12 +66,6 @@ browser.browserAction.onClicked.addListener(async tab => {
 });
 
 
-export interface Shim {
-    bridgePort: browser.runtime.Port;
-    contentPort?: browser.runtime.Port;
-    contentTabId?: number;
-    contentFrameId?: number;
-}
 
 const activeShims = new Set<Shim>();