Yeah, a little oddly worded. It's basically saying visit the Firefox/Chrome store to either download OR find out more about the add-on. I'm not sure why the web

Yeah, a little oddly worded. It's basically saying visit the Firefox/Chrome store to either download OR find out more about the add-on. I'm not sure why the website I'm on can't tell me more about it.. But I agree with the other poster in that you parsed the sentence incorrectly.