Firefox userChrome script

1. Open external downloader directly from Firefox's native download asking dialog. Adds a button to call system command and pass argument to it. (Modify it yourself to use your downloader)
2. Show automatically-started download progress

Tested on Firefox 128.

This script needs to be improved still, I think

1. pass cookie and reference url to external downloader also
2. make use of the auto-started download partial file

welcome open issue or PR if you have any idea.

This repo only contains the specific function, doesn't contain the code to enable userchrome scripts.

For how to enable, see: (also more of my scripts)

https://garywill.github.io/#Firefox-userChrome-CSS-or-JS