"In der aktuellen Java-Version 7 Update 10 klafft eine kritische Sicherheitslücke, die offenbar bereits im großen Stil für Cyber-Angriffe ausgenutzt wird. Wer Java auf seinem Rechner installiert hat, sollte das Java-Plug-in im Browser umgehend deaktivieren."
winnigorny1 
IRON67 „Mei, bist du aber ein schwieriger Fall! Ich beginne nun ...“
Ich beginne nun allmählich, deinen Firefox als Schuldigen zu betrachten.
If the Java (TM) Platform plugin is no longer detected after updating to the latest Java 7 JRE and the previous suggestion to uninstall JavaFX doesn't resolve the issue (or if there is no JavaFX listed to uninstall), your Java 7 installation may be missing this Windows Registry key, which Mozilla browsers need to detect the Java plugin:
(64-bit Windows) HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin
(32-bit Windows) HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins\@java.com/JavaPlugin
The problem has been reported by users after updating to Java 7 Update 10 or Java 7 Update 11. If you're comfortable with a registry fix, you can do one of the following:
Option 1: Add back the missing registry key using a .reg file containing the code posted in this post for Java 7 Update 10 on 64-bit Windows (you'll need to change "Version"="170_10" to "Version"="170_11" for Java 7 Update 11). A list of the needed registry keys for Java 7 Update 11 on 32-bit Windows has been posted here. The first line of the .reg file MUST be Windows Registry Editor Version 5.00 so you should position your mouse cursor at the beginning of that line, then select and copy the rest of the code. [46] [47] [48]
Option 2: Uninstall ALL versions of Java and JavaFX, use a registry editor to delete these registry keys, if they are not empty, and then reinstall Java 7. [49] [50]
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Plug-in
Note: Oracle is aware of the issue and a fix will be released in an upcoming Java update. [51]
If all else fails, as a temporary workaround until a fixed version of Java 7 is released, you can try downgrading to Java 6. To downgrade, uninstall Java (all versions, including JavaFX, if installed) and then download and install the latest Java 6 JRE"
Ich werde wohl nicht an meiner Registry rumbasteln, sondern auf den Fix warten, um meine Steuererklärung abgeben zu können - und solange muss das Finanzamt dann leider noch warten.....
Respektive ich, denn ich werde ein kleine Erstattung bekommen.....
