web/genericl10n.js

@@ -121,10 +121,7 @@ class GenericL10n extends L10n {
       const { href } = document.querySelector(`link[type="application/l10n"]`);
       const paths = await fetchData(href, /* type = */ "json");
 
-      return {
-        baseURL: href.substring(0, href.lastIndexOf("/") + 1) || "./",
-        paths,
-      };
+      return { baseURL: href.replace(/[^/]*$/, "") || "./", paths };
     } catch {}
     return { baseURL: "./", paths: Object.create(null) };
   }