Firefox Vs. Tumblr

Does anyone else have this issue? I go to save an image file from Tumblr in Firefox, and instead of saving it as whatever the extension in the URL is (.gif, .png, .jpg), it wants me to save it as an HTML document. It doesn’t seem to happen anywhere else (LiveJournal, for example), and it drives me crazy.

Also not keen on the whole Tumblrize-plugin-not-working thing, either. *Pokes things*