Hi,
Thank you all for your patience, I have submitted v1.2.0 on Mozilla and it will soon be approved and released for all users. This release fixes the major issue which caused no definitions for all the words.
I am sorry for the delay caused in fixing this issue. Sorry for all the inconvenience caused.
Let me know if you still face any issue in the add-on. Currently, the v1.2.0 is getting reviewed and it will be available in 1-2 days.
Thanks and Regards
meetDeveloper