Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox Developer 64 bits can't use Microsoft Silverlight (64 bits) and Java 8 (64 bits)

  • 5 replies
  • 45 have this problem
  • 15 views
  • Last reply by James

more options

I'm using Firefox Developer (42.0a2 (2015-08-26)). I've installed Silverlight (64 bits) and Java 8 (64 bit) but I can't use any web that use Silverlight or Java.

I'm using Firefox Developer (42.0a2 (2015-08-26)). I've installed Silverlight (64 bits) and Java 8 (64 bit) but I can't use any web that use Silverlight or Java.
Attached screenshots

Chosen solution

hi, 64bit versions of firefox on windows will only support flash as npapi plugin. if you want to use other plugins as well you'd have to continue to use regular 32bit builds. this is by design, as mozilla wants to take a clean slate approach to plugins on win 64bit apparently: https://wiki.mozilla.org/Firefox/win64/meetingarchive#Clean_Slate_Approach

Read this answer in context 👍 2

All Replies (5)

more options

Sorry it does not work with those yet.

For 64bit Firefox for Windows only the 64 bit Flash plugin can be used. If you need to use other plugins use the standard 32 bit Firefox with 32 bit plugins.

Whether this will change in the near future or not I do not know, I have not followed the issue too closely.


For ordinary users Firefox for Windows is a 32bit browser and need 32 bit or 32 bit compatible plugins.

more options

Can I use 64 bits plugins in Firefox Beta 64 bits? I have to use Java 64 bits with other software.

Modified by Illuminator

more options

Chosen Solution

hi, 64bit versions of firefox on windows will only support flash as npapi plugin. if you want to use other plugins as well you'd have to continue to use regular 32bit builds. this is by design, as mozilla wants to take a clean slate approach to plugins on win 64bit apparently: https://wiki.mozilla.org/Firefox/win64/meetingarchive#Clean_Slate_Approach

more options

Thank to Jonn99 and philipp. Hope to see Sliverlight support soon :)

more options

Yes Win64 Firefox as of 41.0+ will only have the 64-bit Flash Player white listed currently.

The 64-bit Mac OSX and Linux builds can still use any available 64-bit npapi plugins for the os.