I recently released a Chrome extension that converts webpages to PDF. It's free, but you need to register to get a key. Unfortunately, this solution isn't client-side JavaScript; I'm using an API underneath. To be honest, I mainly created it to promote the API, but if it's useful for people, I might develop it further. Perhaps it could be useful to you in some way. I don't know your requirements, but maybe with this base in the form of this extension, it wouldn't be difficult to add something that meets your expectations, let me know. However, if you want to export a PDF from Ahrefs, for example, I'm afraid that might not be possible; currently, only basic authentication is supported. Unless maybe I could add an option like in my API to pass JavaScript code, but I also doubt that would work because Ahrefs probably has some bot protection.

edit: i forgot the link https://chromewebstore.google.com/detail/pdfbolt-web-to-pdf/...