269948 - Firefox and JRE 5.0 doesn't work with MSIE-browser agent

Status: VERIFIED DUPLICATE of bug 83376

(Firefox :: General, defect)

Description

[Sencer]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.5) Gecko/20041108 Firefox/1.0
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.5) Gecko/20041108 Firefox/1.0

If general.useragent.override is set to an MSIE useragent (*), then viewing a
web-page with an embedded applet shows a blank where the applet should be. On
one system of mine it shows a very obscure error-message-popup-box, on the other
I get no message at all.

(*) example: 
user_pref("general.useragent.override", "Mozilla/4.0 (compatible; MSIE 6.0;
Windows NT 5.1;)");

Reproducible: Always
Steps to Reproduce:
1. Make sure you have JRE 5.0 installed ( jre-1_5_0-windows-i586.exe )
2. Go in your profiles folder, add the following line:

user_pref("general.useragent.override", "Mozilla/4.0 (compatible; MSIE 6.0;
Windows NT 5.1;)");

3. Close and restart your browser and view a page with an applet, e.g.

http://java.sun.com/applets/other/TumblingDuke/index.html
Actual Results:  
The applet is missing - the place is blank. And on some systems I get an obscure
error message pop-up about a NullPointerException at
"com.sun.deploy.net.proxy.WNetscape4ProxyConfig.getNSversion(Unknown Source)"
, screenshots are here:
http://www.sencer.de/article/671/

Expected Results:  
The applet should have loaded and be displayed.

I assume this is related to the way the JRE is invoked.

Comment 1

[Matthias Versen [:Matti]]

*** This bug has been marked as a duplicate of 83376 ***