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I check this at: http://javatester.org/version.html

I already downloaded the latest SDK. It seems the issue is that

Java (TM) Platform SE 7 U5 10.5.1.255 has a warning that it has vulnerability and use with caution.

The thing is it's NOT disabled.

Also I already updated JDK to the latest version. I want to uninstall the plugin but there is no such option. I can only disable.

My other computer's firefox are doing fine.

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I don't understand how you can have Java 7 Update 5 installed but "already downloaded latest SDK". I suggest you use singularlabs.com/software/javara/javara-download to uninstall any version you have installed then install the current version. –  Ramhound Jan 20 '13 at 6:46
    
There is a bug in firefox that says that if things went south I need to reinstall firefox. I don't bother. I just activate java when I need to. –  Jim Thio Jan 20 '13 at 9:11
    
Actually that's the issue. I installed the latest SDK and still have Java 7 Update 5 installed as plugin. –  Jim Thio Jan 21 '13 at 2:51
    
@JimThio You mentioned that your System is 64 bit. I hope you did download and installed the 32 bit Java SDK (x86) as Firefox is 32 bit. On a 64 bit OS, one needs to install both x86 and x64 bit Java. –  Ganesh R. Jan 21 '13 at 5:21
    
firefox is a 32 bit apps? –  Jim Thio Jan 22 '13 at 12:19

2 Answers 2

up vote 3 down vote accepted

The latest version of Java is 1.7.0_11 i.e. Update 11. Even that has a security vulnerability and hence is disabled by default in Firefox (I think Firefox 17 started disabling unsafe plugins by default)

Try updating to Java 7 Update 11. Also once you update and open Firefox, if any site needs Java, a small red icon will come in the address bar. Just click to enable Java for that Firefox session. Else go to add ons manager and permanently enable it.

enter image description here

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You need the 32 bit Java, not the 64. You can have both. Firefox is one of the easier browsers to get Java working. You want the JRE, currently 1.7.0_11.

Sometimes you must reinstall Firefox after upgrading your Java. For other tips, see http://mindprod.com/jgloss/firefox.html

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My systen is 64 bits. –  Jim Thio Jan 21 '13 at 2:51
    
@JimThio - You should update the original question if thats the case. Of course it really doesn't matter since if your using a 32-bit browser. –  Ramhound Jan 22 '13 at 12:04

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