User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Steps to reproduce:

When downloading a file, which already exists, you only have 2 options,
over write the existing file, or-rename it, or cancel the download file.
It would be nice if the software checked for existing file, and give you the option of opening existing file, with it's default handler program as well.
This would save, reloading the same file again. And save going to the file dialog step if you wont to open it with out downloading it again. Big saving on large files.
Of coarse it would also be nice if the sever keep a hash of the file, so could easy compared (with out downloading again) the hash of the ready download version.
But given the internet that would be to much of a ask.

Lachlan

(In reply to laudas1 from comment #0)

Of coarse it would also be nice if the sever keep a hash of the file, so could easy compared (with out downloading again) the hash of the ready download version.

Indeed the problem is that we cannot tell if the file is the same, without checking a hash, and not every download source supports that, indeed I suspect most don't.
It looks related to bug 292481. It's not a trivial thing, and most users/downloads wouldn't benefit because it's not a widespread format.

It may end up being a wontfix, P5 for now.