[Lula] Bizarre. Firefox can't read a file, but wget can?

[Dan Kegel]

Try retrieving the signatures for the latest liberation fonts
https://www.redhat.com/promo/fonts/

wget https://www.redhat.com/f/fonts/liberation-fonts.tar.gz.asc
works fine, but Firefox 2.0.0.13 says

/tmp/ithh2jk0.asc could not be saved, because the source file could
not be read.  Try again later, or contact the server administrator

And afterwards, that file exists but is empty:
-rw------- 1 dank dank 0 2008-04-02 06:46 /tmp/ithh2jk0.asc

I guess it's a firefox bug?