gnus and nnrss html

[Richard G Riley]

I have the following in my .gnus.el

,----
| ;; Set the default value of `mm-discouraged-alternatives'.
| (add-to-list
|     'gnus-newsgroup-variables
|     '(mm-discouraged-alternatives
|       . '("text/html" "image/.*")))
| 
| ;;Display `text/html' parts in `nnrss' groups.
| (add-to-list
|  'gnus-parameters
|  '("\\`nnrss:" (mm-discouraged-alternatives nil)))
`----

The problem I have is that any links in the html are displayed as
"linkname" with the url hidden. I usually have a key bound to
(browse-url-firefox url &optional new-window) but this only works on
"visible" urls. How can I extract the underlying url in articles on nrss
folders which are being displayed as rendered html?