Can you post more information please? 1. Have you made any recent changes to your Firefox browser? 2. Can you upload some screenshots? This is necessary to understand exactly what is going on.

@Manojit_Ghosh - I use Firefox as it comes "out of the box". The same problem also occured before the latest update to 26.0 . Attached is how a file looks in IE and how it looks in Firefox. As said, in Firefox it used to be OK, now it is OK only for two seconds and then it collapses.

There is a possibility that you have changed some settings in the browser or installed something which is causing the problem. I am on Windows 7 Professional, Firefox 26.0 and I don't see any problem. See the screenshot.

@Manojit_Ghosh - Thanks! If others don't have the problem, then it is OK. I will use IE in such cases.

With what content type does the server send the file?

You can check that in Tools > Page Info > General and on the Network tab in the Web Console (Firefox/Tools > Web Developer;Ctrl+Shift+K).

• https://developer.mozilla.org/Tools/Web_Console

You can prefix the link with the view-source: protocol to make Firefox display the page source.

• view-source:https://support.mozilla.org/en-US/questions/984768

@cor-el - Thank you! I followed your instructions. The results are in attached screen dumps. Does this give you an idea what wrong?

Does it help if you create a new Boolean pref with the name layout.xml.prettyprint and set the value to true?

You can open the about:config page via the location bar and accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config