I'm using a PDF viewer on the frontend which can only read .pdf URLs (it's not able to read blob directly). So I'll need to download those files to the user's computer first. Hypothetically, this is what I want to do:

// download blob
let pdf = fetch(mysite.com);

// store in a temporary folder
// maybe "%AppData%\Local\Google\Chrome\User Data\Default\Cache"?
browser.storeFile(pdf);

// retrieve the file from temporary folder and pass to PDF viewer
myPDFViewer.load('%AppData%\Local\Google\Chrome\User Data\Default\Cache\my-file.pdf')

The PDF viewer I'm using can load offline files perfectly fine, as long as I have the absolute path to the file (ending with .pdf). I have tried all sorts of things but still not able to generate such .pdf URLs from the fetched blob.

So, is it possible to download files, store them in a temporary folder internal to the browser (which will get cleaned up automatically), and generate absolute local paths to those files?