OneDrive DavFS Cookie Finder per John Beard

If you want to mount a OneDrive directory using DavFS, you might need to
keep the cookies up to date.

This is an extension to help you do that. To use it:

* Install the extension.
* Navigate to any OneDrive directory in the browser
* Click the "cookie" icon in the address bar
* Copy the resulting line to your `/etc/davfs/dsvfs.conf` file
* Mount the drive.