User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.5a) Gecko/20030728 Mozilla Firebird/0.6.1 Build Identifier: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.5a) Gecko/20030728 Mozilla Firebird/0.6.1 Because not every app can know about every MIME file type, the types have two parts separated by a slash. The first part is a general description such as 'text' and the second part something more specific. I think the intention is that if an app doesn't know exactly how to display text/x-obscure-format, it can at least fall back to displaying it as text. However, the URL mentioned above serves a MIME type of text/x-python but Firebird does not display the content as text; instead it prompts about downloading. The MIME type indicates a text document so the page should be displayed as such. RFC 1341 seems to suggest this behaviour, though it does not mandate it: >In general, the top-level Content-Type is used to declare >the general type of data, while the subtype specifies a >specific format for that type of data. Thus, a Content-Type >of "image/xyz" is enough to tell a user agent that the data >is an image, even if the user agent has no knowledge of the >specific image format "xyz". Such information can be used, >for example, to decide whether or not to show a user the raw >data from an unrecognized subtype -- such an action might be >reasonable for unrecognized subtypes of text, but not for >unrecognized subtypes of image or audio. In the particular case of a web browser, it seems reasonable to always present textual data to the user when possible. That way the user has a choice of whether to view the document in the browser window or use 'Save As'. Reproducible: Always Steps to Reproduce: 1. View <http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/freevo/freevo/helpers/xml_tv_be.py?rev=HEAD&content-type=text/x-python> Actual Results: A dialogue box appeared asking what to do with this file. Expected Results: The page should have been displayed as plain text, IMHO.

*** This bug has been marked as a duplicate of 57342 ***

there's a bug that fits much better...

*** This bug has been marked as a duplicate of 196078 ***