chrome extension trap download dialog

Question

so on a site that when you hit download, it always asks for a filename when I use a shortcut key to download something - ie it comes up with the "save as" dialog. I want to build a chrome extension to trap that and provide my own filename.

I'm fine with building the extension, I've built lots, but I can't figure out how to trap/inject code into the "save as" dialog. [and it generates a dynamic and complicated url that I can't predict, so I can't download from JS]

Is that possible to do?

Answer 1

I think the answer is "it depends". This page might offer a clue.

If it's an anchor, it looks like a download attribute with a value will be used as the suggested file name.

But then there is this:

Note: if the Content-Disposition header has different information from the download attribute, resulting behavior may differ: If the header specifies a filename, it takes priority over a filename specified in the download attribute.

It might be possible to fiddle with that. Looks like this guy did it on Firefox .