Install permissions:
Read and change all your data on the websites you visit
Wow, that sounds scary! This is broad because I need to know which URL you are on to know when you are on a Google Slide. Once you are on a Google Slides URL, I put the buttons to Translate and Export in the button bar. These are only working when you click them.
Communicate with cooperating websites
This lets me have the Options menu talk to the Chrome extension to work its magic.
Once you have installed it you can use SlidesPro to Export the English captions to a PDF. (Clicking on the Translate button to start the captions.)