Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Шукати в статтях підтримки

Остерігайтеся нападів зловмисників. Mozilla ніколи не просить вас зателефонувати, надіслати номер телефону у повідомленні або поділитися з кимось особистими даними. Будь ласка, повідомте про підозрілі дії за допомогою меню “Повідомити про зловживання”

Докладніше
Ця тема закрита і перенесена в архів. Якщо вам потрібна допомога, запитайте.
Замкнено Архівовано

Firefox ignores response header Content-Type

Firefox Збої в роботі сайтів
SuMo Bot відповів
SuMo Bot
SuMo Bot

I have a configured nginx server returning the following headers when serving plain, non-UTF encoded text files.

Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: inline

When the text files contain ANSI escape sequences (Standard ECMA-48) Firefox will often ignore the server Content headers to use a guess determined by the file extension. But the guess is often wrong and forces the browser to download the file instead of displaying it in the tab.

Cause: document Type: application/x-vnd.mozilla.guess-from-ext; charset=ISO-8859-1

Is this intended behavior and is there anything else I can do to encourage Firefox to display the text file in a browser tab? As this is not the same behavior with other browser engines such as Blink or Trident.

6 sample files, all refuse to display in Firefox except 'r5-WTF4.ans' https://retrotxt.com/e/

I have a configured nginx server returning the following headers when serving plain, non-UTF encoded text files. Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: inline When the text files contain ANSI escape sequences (Standard ECMA-48) Firefox will often ignore the server Content headers to use a guess determined by the file extension. But the guess is often wrong and forces the browser to download the file instead of displaying it in the tab. Cause: document Type: application/x-vnd.mozilla.guess-from-ext; charset=ISO-8859-1 Is this intended behavior and is there anything else I can do to encourage Firefox to display the text file in a browser tab? As this is not the same behavior with other browser engines such as Blink or Trident. 6 sample files, all refuse to display in Firefox except 'r5-WTF4.ans' https://retrotxt.com/e/

Усі відповіді (2)

SuMo Bot
SuMo Bot Автор питання

cor-el said

See:

Hi thanks, but it seems with Firefox nosniff only works with script or css, but not text/plain.

Note: nosniff only applies to "script" and "style" types.

nosniff 

   Blocks a request if the requested type is

       "style" and the MIME type is not "text/css", or
       "script" and the MIME type is not a JavaScript MIME type.
SuMo Bot
SuMo Bot Автор питання

This question has been locked because the original author has deleted their account. While you can no longer post new replies, the existing content remains available for reference.