Java browser plugin doesnt't work in Firefox

[acheron2]

I have IcedTea-Web Plugin installed, but no Java applets seem to work in browser. For example, when I go to http://java.com/en/download/installed.jsp , enable scripts and press "Verify Java version", I eventually get the message "We are unable to verify if Java is currently installed and enabled in your browser.". If I disable NoScript and restart Firefox, I am asked for a permission to run a signed program on that page, but otherwise nothing changes. Same for all versions I tried this year and earlier.

about:plugins output:

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IcedTea-Web Plugin (using IcedTea-Web 1.3.2)

    File: IcedTeaPlugin.so
    Version: 
    The IcedTea-Web Plugin executes Java applets.

MIME Type 	Description 	Suffixes
application/x-java-vm 	IcedTea 	class,jar
application/x-java-applet 	IcedTea 	class,jar
application/x-java-applet;version=1.1 	IcedTea 	class,jar
application/x-java-applet;version=1.1.1 	IcedTea 	class,jar
application/x-java-applet;version=1.1.2 	IcedTea 	class,jar
application/x-java-applet;version=1.1.3 	IcedTea 	class,jar
application/x-java-applet;version=1.2 	IcedTea 	class,jar
application/x-java-applet;version=1.2.1 	IcedTea 	class,jar
application/x-java-applet;version=1.2.2 	IcedTea 	class,jar
application/x-java-applet;version=1.3 	IcedTea 	class,jar
application/x-java-applet;version=1.3.1 	IcedTea 	class,jar
application/x-java-applet;version=1.4 	IcedTea 	class,jar
application/x-java-applet;version=1.4.1 	IcedTea 	class,jar
application/x-java-applet;version=1.4.2 	IcedTea 	class,jar
application/x-java-applet;version=1.5 	IcedTea 	class,jar
application/x-java-applet;version=1.6 	IcedTea 	class,jar
application/x-java-applet;version=1.7 	IcedTea 	class,jar
application/x-java-applet;jpi-version=1.7.0_50 	IcedTea 	class,jar
application/x-java-bean 	IcedTea 	class,jar
application/x-java-bean;version=1.1 	IcedTea 	class,jar
application/x-java-bean;version=1.1.1 	IcedTea 	class,jar
application/x-java-bean;version=1.1.2 	IcedTea 	class,jar
application/x-java-bean;version=1.1.3 	IcedTea 	class,jar
application/x-java-bean;version=1.2 	IcedTea 	class,jar
application/x-java-bean;version=1.2.1 	IcedTea 	class,jar
application/x-java-bean;version=1.2.2 	IcedTea 	class,jar
application/x-java-bean;version=1.3 	IcedTea 	class,jar
application/x-java-bean;version=1.3.1 	IcedTea 	class,jar
application/x-java-bean;version=1.4 	IcedTea 	class,jar
application/x-java-bean;version=1.4.1 	IcedTea 	class,jar
application/x-java-bean;version=1.4.2 	IcedTea 	class,jar
application/x-java-bean;version=1.5 	IcedTea 	class,jar
application/x-java-bean;version=1.6 	IcedTea 	class,jar
application/x-java-bean;version=1.7 	IcedTea 	class,jar
application/x-java-bean;jpi-version=1.7.0_50 	IcedTea 	class,jar
application/x-java-vm-npruntime 	IcedTea 	

(No suffixes in the last line. Is this correct?)

Output of some other commands:

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$ eselect java-nsplugin list
Available 32-bit Java browser plugins
Available 64-bit Java browser plugins
  [1]   icedtea-7  current

$ eselect java-vm list
Available Java Virtual Machines:
  [1]   icedtea-7  system-vm

$ eix -I icedtea
[I] dev-java/icedtea
     Available versions:  
     (6)    ~6.1.12.4 ~6.1.12.5 ~6.1.12.6
     (7)    ~7.2.3.12 (~)7.2.4.1
       {+X +alsa cacao cjk +cups debug doc examples javascript +jbootstrap +nsplugin +nss pax_kernel pulseaudio +source systemtap test +webstart zero ELIBC="FreeBSD"}                                                        
     Installed versions:  7.2.4.1(7)(03:58:18 21.09.2013)(X alsa jbootstrap nsplugin nss source webstart -cjk -cups -debug -doc -examples -javascript -pax_kernel -pulseaudio -systemtap -test ELIBC="-FreeBSD")              
     Homepage:            http://icedtea.classpath.org
     Description:         A harness to build OpenJDK using Free Software build tools and dependencies

[I] dev-java/icedtea-web
     Available versions:  
     (6)    ~1.3.1 (~)1.3.2
     (7)    ~1.3.1-r7 (~)1.3.2-r7
       {build doc gtk2 gtk3 javascript +nsplugin test ELIBC="FreeBSD"}
     Installed versions:  1.3.2-r7(7)(03:59:06 21.09.2013)(nsplugin -build -doc -javascript -test ELIBC="-FreeBSD")                
     Homepage:            http://icedtea.classpath.org
     Description:         FOSS Java browser plugin and Web Start implementation

$ eix -I firefox
[I] www-client/firefox
     Available versions:  *10.0.11 17.0.5 17.0.6 17.0.7 17.0.8 ~23.0 {+alsa bindist custom-cflags custom-optimization +dbus debug gstreamer +ipc +jit libnotify +minimal pgo pulseaudio selinux startup-notification system-cairo system-jpeg system-sqlite +webm wifi LINGUAS="af ak ar as ast be bg bn_BD bn_IN br bs ca cs csb cy da de el en_GB en_ZA eo es_AR es_CL es_ES es_MX et eu fa fi fr fy_NL ga_IE gd gl gu_IN he hi_IN hr hu hy_AM id is it ja kk km kn ko ku lg lt lv mai mk ml mr nb_NO nl nn_NO nso or pa_IN pl pt_BR pt_PT rm ro ru si sk sl son sq sr sv_SE ta ta_LK te th tr uk vi zh_CN zh_TW zu"}                                                                   
     Installed versions:  17.0.8(12:03:35 17.08.2013)(alsa dbus jit minimal system-sqlite -bindist -custom-cflags -custom-optimization -debug -gstreamer -libnotify -pgo -selinux -startup-notification -wifi LINGUAS="ru -af -ak -ar -as -ast -be -bg -bn_BD -bn_IN -br -bs -ca -cs -csb -cy -da -de -el -en_GB -en_ZA -eo -es_AR -es_CL -es_ES -es_MX -et -eu -fa -fi -fr -fy_NL -ga_IE -gd -gl -gu_IN -he -hi_IN -hr -hu -hy_AM -id -is -it -ja -kk -km -kn -ko -ku -lg -lt -lv -mai -mk -ml -mr -nb_NO -nl -nn_NO -nso -or -pa_IN -pl -pt_BR -pt_PT -rm -ro -si -sk -sl -son -sq -sr -sv_SE -ta -ta_LK -te -th -tr -uk -vi -zh_CN -zh_TW -zu")                                        
     Homepage:            http://www.mozilla.com/firefox
     Description:         Firefox Web Browser

What should I do to get Java in browser?

[sebB]

Look here

http://www.java.com/en/download/testjava.jsp

[acheron2]

Look here

http://www.java.com/en/download/testjava.jsp

I was wrong. This one detects Oracle Java. Despite eselect pointing to IcedTea. Is this a bug?

UPDATE: Here is what happens:

1. If dev-java/oracle-jdk-bin-1.7.0.40 is installed and selected. Both pages http://java.com/en/download/installed.jsp and http://java.com/en/download/testjava.jsp correctly finds Oracle Java 7u40. Security warnings appear once for each applet.

2. If dev-java/icedtea-7.2.4.1 and dev-java/icedtea-web-1.3.2-r7 are installed and selected.

http://java.com/en/download/installed.jsp fails to determine if Java is installed and enabled. Firefox console output (appears only for the first run):

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OpenJDK Runtime Environment (IcedTea 2.4.1) (Gentoo build 1.7.0_40-b31)
OpenJDK 64-Bit Server VM (build 24.0-b50, mixed mode)

http://java.com/en/download/testjava.jsp still finds Java SE 7 update 40 from Oracle Corporation. Firefox console output (appears for every run):

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expect: en actual: ru
locale: 'en'

(iIf I change "en" to "ru" in the URL, it becomes "expect: ru actual: ru" and "locale: 'ru'", but nothing else changes.)

Security warnings do not appear.

3. If both Oracle JDK and IcedTea are installed, the results depend on whichever is selected, as above.


Now my questions are:
1. Why cannot the former page http://java.com/en/download/installed.jsp determine if I have Java?
2. Why is IcedTea/OpenJDK vendor detected as Oracle?
3. Why don't security warnings appear for IcedTea/OpenJDK?