feat(content_delegate): Use the URL constructor to return absolute URL

Updates the extractURL method to generate absolute URLs instead of relative ones to fix the issue with document fetching in Firefox and employs regular expressions to refine the URL cleanup process.

src/content_delegate.js

@@ -554,7 +554,10 @@ ContentDelegate.prototype.onDownloadAllSubmit = async function (event) {
       return null;
     }
     // Clean the match found in the HTML
-    return showTempURL[0].replace(';"', '');
+    let relativePath = showTempURL[0].replace(/\"|;/, '');
+
+    // Use absolute paths to avoid issue with Firefox.
+    return new URL(relativePath, window.location);
   };
 
   // helper function - convert string to html document