diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index c7c7be0a1..c9f970dfa 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -2240,10 +2240,7 @@ vAPI.net.registerListeners = function() {
         var browser = e.target;
 
         // I have seen this happens (at startup time)
-        // https://github.com/gorhill/uBlock/issues/948
-        //   On older version of Firefox, `browser.webNavigation` can be null,
-        //   which would cause currentURI to fail.
-        if ( !browser.webNavigation || !browser.currentURI ) {
+        if ( !browser.currentURI ) {
             return;
         }