Bug 1014823 - Redirect /.+/firefox/releases/whatsnew/ (404) to /firefox/...

...whatsnew/
Sorry! I had a typo in my last comment - no need for the slash before `firefox`. The rule should be:

`^/(\w{2,3}(?:-\w{2})?/)?firefox/releases/whatsnew(/?)$`

Who reviews the reviewer? :stuck_out_tongue_closed_eyes:

Another small nit pick - you don't really need the `$2`. The destination would be better as `/b/$1/firefox/whatsnew/`.