diff --git a/pywb/static/wombat.js b/pywb/static/wombat.js
index ef256b2a..1e5f9f4b 100644
--- a/pywb/static/wombat.js
+++ b/pywb/static/wombat.js
@@ -1564,19 +1564,22 @@ var _WBWombat = function($wbwindow, wbinfo) {
         var fetch = true;
         var makeBlob = false;
         var rwURL;
-        if (!starts_with(workerUrl, 'blob:')) {
+        var isBlob = workerUrl.indexOf('blob:') === 0;
+        var isJSURL = false;
+        if (!isBlob) {
             if (starts_with(workerUrl, 'javascript:')) {
                 // JS url, just strip javascript:
                 fetch = false;
+                isJSURL = true;
                 rwURL = workerUrl.replace('javascript:', '');
             } else if (!starts_with(workerUrl, VALID_PREFIXES.concat('/')) &&
                        !starts_with(workerUrl, BAD_PREFIXES)) {
                 // super relative url assets/js/xyz.js
                 var rurl = resolve_rel_url(workerUrl, $wbwindow.document);
-                rwURL = rewrite_url(rurl, false, 'wkr_');
+                rwURL = rewrite_url(rurl, false, 'wkr_', $wbwindow.document);
             } else {
                 // just rewrite it
-                rwURL = rewrite_url(workerUrl, false, 'wkr_');
+                rwURL = rewrite_url(workerUrl, false, 'wkr_', $wbwindow.document);
             }
         } else {
             // blob
@@ -1597,10 +1600,19 @@ var _WBWombat = function($wbwindow, wbinfo) {
         }
 
         if (wbinfo.static_prefix || wbinfo.ww_rw_script) {
+            var originalURL;
+            if (isBlob || isJSURL) {
+                originalURL = $wbwindow.document.baseURI;
+            } else if (workerUrl.indexOf('/') === 0) {
+                // console.log(workerUrl);
+                originalURL = resolve_rel_url(extract_orig(workerUrl), $wbwindow.document);
+            } else {
+                originalURL = extract_orig(workerUrl);
+            }
             // if we are here we can must return blob so set makeBlob to true
             var ww_rw = wbinfo.ww_rw_script || wbinfo.static_prefix + "ww_rw.js";
             var rw = "(function() { " + "self.importScripts('" + ww_rw + "');" +
-                "new WBWombat({'prefix': '" + wb_abs_prefix + 'wkr_' + "/'}); " + "})();";
+                "new WBWombat({'prefix': '" + wb_abs_prefix + 'wkr_' + "/','originalURL':'"+originalURL+"'}); " + "})();";
             workerCode = rw + workerCode;
             makeBlob = true;
         }
diff --git a/pywb/static/ww_rw.js b/pywb/static/ww_rw.js
index e9e36d08..08e1ef63 100644
--- a/pywb/static/ww_rw.js
+++ b/pywb/static/ww_rw.js
@@ -1,13 +1,24 @@
 // pywb mini rewriter for injection into web worker scripts
 
 function WBWombat(info) {
+    function maybeResolveURL(origURL) {
+        try {
+            var resolved = new URL(origURL, info.originalURL);
+            return resolved.href;
+        } catch (e) {
+            return origURL;
+        }
+    }
 
     function rewrite_url(url) {
+        if (url.indexOf('blob:') === 0) return url;
+        if (url && info.originalURL && url.indexOf('/') === 0) {
+            url = maybeResolveURL(url);
+        }
         if (info.prefix) {
             return info.prefix + url;
-        } else {
-            return url;
         }
+        return url;
     }
 
     function init_ajax_rewrite() {
@@ -35,8 +46,8 @@ function WBWombat(info) {
 
     function rewriteArgs(argsObj) {
         // recreate the original arguments object just with URLs rewritten
-        var newArgObj = {length: argsObj.length};
-        for (var i = 0; i < argsObj.length; i++) {
+        var newArgObj = new Array(argsObj.length);
+        for (var i = 0; i < newArgObj.length; i++) {
             var arg = argsObj[i];
             newArgObj[i] = rewrite_url(arg);
         }
@@ -69,4 +80,3 @@ function WBWombat(info) {
         };
     }
 }
-