Hello,
Thanks for sharing the link, well I have understood the requirement I am aware of creating the Extention for both Chrome and Firefox.
But my question is do you want exactly the same features? Do you have anything to be added? Is it will be for Netflix only or other like Hulu, Amazon Prime?
How about we discuss on chat to clear out the doubts. please ping me I am available.
Exact estimation can be shared after clear understanding.
Regards,
SA