RASA NLU inbox gets stuck while annotating data

Hi , I am on an old version of rasa x .Below are the version details: (rasax_2_venv) $ rasa --version Rasa Version : 2.8.1 Minimum Compatible Version: 2.8.0 Rasa SDK Version : 2.8.1 Rasa X Version : 0.39.3 Python Version : 3.8.0

While trying to annotate bulk data from NLU inbox , the window is frozen. Firefox throws an error saying “The page is slowing down Firefox” .It also errors out with unresponsive scripts . Can you please help ? I have already cleared the cache and tried the workarounds from browser side.