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No Java plugin

  • 7 回覆
  • 117 有這個問題
  • 742 次檢視
  • 最近回覆由 cor-el

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I got a notice of a Java update. Installed it. The verification did not work. In add-ons> plugins IS NO JAVA AT ALL! It's no place else either. I have 43.0.4.???

I got a notice of a Java update. Installed it. The verification did not work. In add-ons> plugins IS NO JAVA AT ALL! It's no place else either. I have 43.0.4.???

被選擇的解決方法

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:43.0) Gecko/20100101 Firefox/43.0

You have the 64-bit version of Firefox, where only Silverlight and Flash Plugins are 'whitelisted'. If you need Java you need to install the 32-bit version of Firefox. You can have both the 64-bit and 32-bit versions installed, but you'll need to do a "custom" installation (on the first screen of the installer routine) and select or create a uniquely named folder - like maybe Firefox 32, otherwise the 32-bit installer may overwrite your 64-bit Firefox installation.

從原來的回覆中察看解決方案 👍 10

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Please ensure that you have downloaded Java from the official website. Also please ensure that you close Firefox completely when installing Java, as it may not install correctly if Firefox remains open.


If the above does not help, please try refreshing Firefox's plugin list. To do so, please follow these steps:

  1. Close Firefox
  2. Open your profile folder in Windows explorer
  3. Rename the pluginreg.dat file to pluginreg.dat.old
  4. Open Firefox

This should rebuild your Firefox file that detects what plugins you have installed. You may need to try reinstalling Java if it still does not display.

For more information about your Firefox profile and how to locate it, please refer to this Mozilla support article:

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選擇的解決方法

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:43.0) Gecko/20100101 Firefox/43.0

You have the 64-bit version of Firefox, where only Silverlight and Flash Plugins are 'whitelisted'. If you need Java you need to install the 32-bit version of Firefox. You can have both the 64-bit and 32-bit versions installed, but you'll need to do a "custom" installation (on the first screen of the installer routine) and select or create a uniquely named folder - like maybe Firefox 32, otherwise the 32-bit installer may overwrite your 64-bit Firefox installation.

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the-edmeister said

You have the 64-bit version of Firefox, where only Silverlight and Flash Plugins are 'whitelisted'. If you need Java you need to install the 32-bit version of Firefox.

What does that mean? That it is impossible to have Java in the 64-bit version of Firefox?

When you talk about "whitelisted" this implies one could also whitelist more plugins, such as the Java plugin.

Please elaborate.

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Yes, it is impossible to have any other plugins in the WIn64 version of Firefox. Only Flash and Siverlight are allowed, and no there will not be anymore plugins allowed in the Win64 bit version of Firefox. I agree that 'whitelisted' isn't an appropriate term, but that's what Mozilla decided to call it.

https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plugins-in-firefox/ All support for NPAPI plugins will be gone from Firefox by the end of 2016, or in early 2017 (my opinion that "schedules" always 'slide' beyond what is originally projected).

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Hello! I have the same problem - Java stooped working in Firefox. I deleted the pluginreg.dat - it did not work Uninstalled the 64 bit Java, installed 32 bit - the same thing, still does not work. Any idea?

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newage2012.

Please start your own support thread here while using Firefox - https://support.mozilla.org/en-US/questions/new

Provide the requested information.

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You need to use the 32 bit Firefox version if you need to use plugins other than the Shockwave Flash and Silverlight plugins and this includes the Java plugin that requires 32 bit Firefox and 32 bit Java.

You can find the full 32 bit version of the current Firefox release (47.0.1) in all languages and all operating systems here: