Firefox is being weird

Or rather, it has been since last night. It's ignoring the domain name on some URLs and treating the subdirectory information as the full URL --- which leads to a lot of ridiculous "Server not found" error messages.

For example, I'm trying to look at my friends' status updates on Facebook, which are at this URL: http://www.facebook.com/friends/?status

Firefox tries to load http://friends/?status instead --- and spits it back as an error to me.

Alternatively, if I try to load the main Facebook page (http://www.facebook.com), I get the following error message: "The URL is not valid and cannot be loaded."

Even though several minutes later, so long as the full URL is provided, the very same browser window will happily load the page without any grumbling or misfiring of URLs.

Why is this happening to some pages (so far, Facebook, The New York Times and Wired Blogs) only? Am I right in blaming Firefox? Did I break my browser without realising it?

-----|||||-----
Technorati Tags: Firefox