diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index e101befdb55..27041edf8d7 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -3592,7 +3592,7 @@ impl ScriptThread {
         // Start with the scheme data of the parsed URL;
         // append question mark and query component, if any;
         // append number sign and fragment component if any.
-        let encoded = &load_data.url.clone()[Position::BeforePath..];
+        let encoded = &load_data.url[Position::AfterScheme..][1..];
 
         // Percent-decode (8.) and UTF-8 decode (9.)
         let script_source = percent_decode(encoded.as_bytes()).decode_utf8_lossy();
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index 4825ae0d957..d9ea56030df 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -835815,7 +835815,7 @@
      ]
     ],
     "javascript-urls.window.js": [
-     "4f617beca17082dc8459acb73bca781900170593",
+     "3e3a53003dde5fae29ced12ce9f2c26c7520a87c",
      [
       "url/javascript-urls.window.html",
       {}
diff --git a/tests/wpt/meta/url/javascript-urls.window.js.ini b/tests/wpt/meta/url/javascript-urls.window.js.ini
deleted file mode 100644
index d75425614d2..00000000000
--- a/tests/wpt/meta/url/javascript-urls.window.js.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[javascript-urls.window.html]
-  expected: ERROR
-  [javascript: URL without an opaque path]
-    expected: FAIL
diff --git a/tests/wpt/tests/url/javascript-urls.window.js b/tests/wpt/tests/url/javascript-urls.window.js
index 4f617beca17..3e3a53003dd 100644
--- a/tests/wpt/tests/url/javascript-urls.window.js
+++ b/tests/wpt/tests/url/javascript-urls.window.js
@@ -19,6 +19,12 @@
     "property": "shouldNotExistB",
     "expected": undefined
   },
+  {
+    "description": "javascript: URL with extra slashes at the start",
+    "input": "javascript:///globalThis.shouldNotExistC=1",
+    "property": "shouldNotExistC",
+    "expected": undefined
+  },
   {
     "description": "javascript: URL without an opaque path",
     "input": "javascript://host/1%0a//../0/;globalThis.shouldBeOne=1;/%0aglobalThis.shouldBeOne=2;/..///",