FIX: Empty tab detection with default User-Agent header

src/tab_manager.py

@@ -49,7 +49,10 @@ class TabManager:
         # Make a copy to avoid reference issues
         # Create original for saved requests or loaded history items (anything with content)
         # Only skip for truly blank new requests
-        has_content = bool(request.url or request.body or request.headers)
+        # Consider headers empty if they only contain default headers
+        has_only_default_headers = request.headers == HttpRequest.default_headers()
+        has_non_default_headers = request.headers and not has_only_default_headers
+        has_content = bool(request.url or request.body or has_non_default_headers)
         original_request = HttpRequest(
             method=request.method,
             url=request.url,

src/window.py

@@ -301,10 +301,13 @@ class RosterWindow(Adw.ApplicationWindow):
 
         # Check if it's empty
         request = widget.get_request()
+        # Consider headers empty if they're either empty or only contain default headers
+        from .models import HttpRequest
+        has_only_default_headers = request.headers == HttpRequest.default_headers()
         is_empty = (
             not request.url.strip() and
             not request.body.strip() and
-            not request.headers
+            (not request.headers or has_only_default_headers)
         )
 
         return is_empty