How to detect inline Firefox extension installation, and intercept it - Firefox extension development

Question

I am building Firefox addon am trying to detect inline installation of the Firefox extensions. To be clear, installations on the places that are not on the Mozilla domain. So, when I am on some website, and when I trigger the extension installation (the .xpi file), I want to redirect the user to some website.

Before that dialog box appears, and if that is not possible, very soon after that, the one for 'installation confirmation', I want to redirect the user.

I am not very familiar with the download API, and I really don't know where to start. I have tried adding the listener for the downloads, but no result from it.

background.js (and included downloads in manifest.json )

function handleCreated(item) {
  console.log(item);
}

browser.downloads.onCreated.addListener(handleCreated);

My expectations are to make my addon to recognize that the user is downloading a .xpi file, and perform redirection on some page when that happens.

Edit: Of the redirection is not possible, then replacing websites .xpi with another one would do the job also.

Answer 1

Adding to the list of what I have tried.

I have tried to convert the page into the text format using .text() fro jQuery , and then search for the URL that has .xpi at the end. However, this did not work for some cases. Sometimes, some websites are pulling the .xpi from their own server, using their own API. So it is not a golden solution to my problem.