My client has an extension hosted in the Chrome Web Store, and is looking for a more frictionless install UX on her website than either 1) clicking out to the Chrome Web Store or 2) Chrome's Inline Installation, which triggers an ugly modal that doesn't fit the aesthetic of her site.
Ideally she'd present the user with a button that matches her aesthetic, and the extension would install on click. A confirmation message would be fine as well - the goal is just to make install easier and cleaner for the user.
I found this link on installing external extensions, but the documentation is pretty arcane. Would these approaches deliver the desired UX on Windows and/or Mac computers? Any other ideas?