Build me a Netflix multi subtitles chrome extension -- 2

I am working on a project where my users need need to be able to see Netflix subtiles on their mobile phone. Your job is to make the chrome extension of the project. So I have a Firebase project and I want that when my users activate the subtitles on Netflix, the chrome extension automatically intercept the subtitles and store them into Firestore. To get the subtitles you will need to use this method: [login to view URL] But you need to make the chrome extension able to do this process automatically and then to store the file in Firestore. If you have any question, feel free to ask them.