Couple of things to note:
If the website is properly designed, it doesn’t matter whether you are using 
32-bit or 64-bit Java with a 64-bit browser.  Since plug-in was dropped, it 
calls the program, so it’s running parallel to the browser, not linked like a 
chain.  Which flavour of Java you need depends on how the applet each website 
uses was written.  <shrugs> If done properly it should be able to run on either.

Onto the nitty gritty of Firefox change over:

  *   Firefox 32-bit won’t automatically be replaced by Firefox 64-bit, so 
you’ll need to set up an uninstall for the 32-bit.
  *   If the 32-bit was the default browser, when it uninstalls Windows won’t 
choose another default.  This will result in some odd error messages, like 
clicking a link in Outlook will trigger “Your company’s security policy 
prevents the completion of this action”.  Opening Firefox 64-bit and setting it 
as the default browser resolves this  in Windows 7, as does running a script to 
set it as the default (either as part of the install or after the install).  
Windows 10 you’ll need to go into the Default Apps.  I haven’t found a script 
to automate this for Windows 10.
  *   Any shortcuts set up by the user (for instance if they’ve pinned it the 
task bar) to the 32-bit version won’t be automatically uninstalled or 
redirected.  The easiest solution is to manually delete them and recreate the 
shortcut / re-pin to task bar for the 64-bit version.
  *   Some users needed to clear their cookies / browsing history to display 
some web-pages (for instance the IIP site).
  *   This may be unique to us, but the 64-bit doesn’t mind the intranet pages, 
but doesn’t like getting the proxy settings from the local machine to access 
the internet.  Setting it to auto-detect the proxy settings instead seems to 
resolve this issue.

Can’t think of anything else right now.



Will Spratt
IT Science Support Specialist
Tel:         01904 46 2631

From: Enterprise [] On Behalf Of Kris Lou
Sent: 09 February 2018 19:02
Subject: Re: [Mozilla Enterprise] [From: EXTERNAL] Re: Anyone migrate to 64-bit?

It is my understanding that Java NPAPI plugins are only supported on 52-ESR 

Important: The Windows 64-bit version of Firefox 52 ESR only supports the Adobe 
Flash and Microsoft Silverlight plugins. If you also need support for Java or 
other installed plugins, choose the Windows (32-bit) download.

Because of this, I'm holding out on 64-bit ESR until FF60.

Kris Lou<>

On Fri, Feb 9, 2018 at 10:56 AM, Delise, John 
<<>> wrote:
Do your users use Java based Web sites? If so, did you have to load a 64-bit 
version of Java on your workstations to accommodate them?

Thank you,

John Delise
Windows Deployment Engineer
VW Credit, Inc.
IT Operations
1401 Franklin Boulevard
Libertyville, IL 60048
United States of America

Phone +1(847) 371-4136<tel:(847)%20371-4136><>


From: Enterprise 
On Behalf Of Jim Weill
Sent: Friday, February 9, 2018 11:54 AM
To: Jason Jackson <<>>;<>
Subject: [From: EXTERNAL] Re: [Mozilla Enterprise] Anyone migrate to 64-bit?

We deploy via batch scripts, and I migrated all our Windows clients to 64-bit 
around 52.4 or so.  So far nobody has complained that I am aware of.


On 2/8/2018 10:56 AM, Jason Jackson wrote:
For those of you who migrated your organization to 64-bit Firefox, did you 
encounter any problems with this?  I’d be using CCK2 for deployment, but I’d 
also like to hear if there were compatibility issues with any sites or web 

Jason Jackson
Computer Systems Technician
North Vancouver School District


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