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"Plugin needed to display," but I have the plugin

  • 9 Antworten
  • 2 haben dieses Problem
  • 38 Aufrufe
  • Letzte Antwort von jscher2000

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I have an applet that I need to run for work. I need Java to run it. I know that I have Java, because I went to the website and made sure I have the most recent update. I don't have old versions on my computer.

But when I go to the website, I get a huge black box saying "A plugin is needed to display this content."

I can make this work in IE, but not Firefox. What can I do to make this work in Firefox? Is there a setting somewhere that is preventing Firefox from running Java when I go to this website?

Alle Antworten (9)

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Type about:addons<enter> in the address bar to open the Add-ons Manager. Hot key; <Control>(Mac:<Command>) <Shift> A)

On the left side of the page, select Plugins. Make sure the ones you want to use are set to Ask or Allow.


Go to the web page. Once the page is loading, mouse to the address bar and Left click the icon. A window for displaying site information should come up. Select More Information. Now select Permissions. In the menu, Make sure the ones you want to use are set to Ask or Allow.

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Thank you for this. From what I see, in both the Add-ons Manager and in Permissions, it says Always Ask and Use Default respectively, so it should be working already.

However, there was a second Java Add-on, called Java Deployment Toolkit 8.0.450.14 11.45.2.14, which is a blocked Add-on (from the information given in the Mozilla information). Could that be the necessary plug-in I need, but Mozilla is blocking it while IE isn't?

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jpe228 said

there was a second Java Add-on, called Java Deployment Toolkit 8.0.450.14 11.45.2.14, which is a blocked

Mozilla blocks this for security reasons. That is JavaScript. But Firefox uses it's own version, so do not worry about it.


Java Downloads for All Operating Systems


Make sure your Java (Not JavaScript) is up to date Verify Java and Find Out-of-Date Versions {web link}

Version 8 Update 45

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You do not need the Java Deployment Toolkit, this is only required in special cases like by Java developers.


You can try to right-click that area and click Inspect Element to open the Inspector and navigate up in the DOM tree to the object element that would have loaded the plugin if it is installed.

Can you attach a screenshot that shows the element with the plugin code?

  • Use a compressed image type like PNG or JPG to save the screenshot
  • Make sure that you do not exceed the maximum size of 1 MB
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@FredMcD, I have checked and I have Java 8.45 and it is still not working.

@cor-el, I have attached a screenshot of the plugin code.

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Update your VLC Player; 2.2.1

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I have updated VLC, the plugin still will not work.

Thank you for helping me so far.

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Could you check whether Firefox has registered Java as the plugin to handle the content type "application/x-java-applet" shown in that screen shot of the Inspector? To do that:

Type or paste about:plugins in the address bar and press Enter. Once the page loads, you can use Find (Ctrl+f) to search for x-java and see whether "application/x-java-applet" is listed under Java(TM) Platform SE 8 U45 as expected.

I notice the type attribute for the embed element also mentions a particular (older) version of Java but I don't know whether that is considered a minimum, maximum, or required match, or whether it is ignored.

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jscher2000 said

I notice the type attribute for the embed element also mentions a particular (older) version of Java but I don't know whether that is considered a minimum, maximum, or required match, or whether it is ignored.

Looking into this a bit more, a few years ago, one user reported having to add the full version-specific type string to the Windows registry so that Firefox would associate it with the current version of the plugin, while another modified a Firefox settings file (pluginreg.dat). These are both unappealing hacks, so hopefully there is a better solution if your Firefox, like theirs, doesn't understand the jpi-version as a minimum and requires an exact match.