Silverlight on Mac OS Mojave

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Level 1

9 points

Silverlight on Mac OS Mojave

I am using Firefox ESR 52.1.0 on a MacBook. I was on Mac OS High Sierra and Silverlight was working on Safari until I installed Safari 12. At that point Firefox ESR 52.1.0 still ran Silverlight. I along with other users of a company Silverlight application have updated to Mac OS Mojave. All of the Apple documentation I have found notes that Safari no longer supports NPAPI but doesn't say anything else about the Mac OS Mojave blocking other applications from using these types of plugins.

Can you shed any light around Silverlight being completely dead on Mac OS Mojave users? Should the notes around NPAPI really have just said that Silverlight can't be run on Mac OS Mojave period instead of just on Safari. I'm still holding out some hope that I can run Silverlight but I may need to roll back to High Sierra as this is critical for my work. I understand that Silverlight is old, but if my company assumes the security risk around using Silverlight then I say make it possible to run Silverlight. Microsoft is holding out support for another 3 years on Silverlight.

Thanks!

MacBook Pro, macOS Mojave (10.14)

Posted on Sep 27, 2018 7:59 AM

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Answer 1

Best reply

dialabrain

Level 10

122,555 points

Sep 27, 2018 10:42 AM in response to richdjw

Silverlight works fine in Mojave using Firefox 52.9.0. ESR

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Answer 2

richdjw Author

Level 1

9 points

Sep 27, 2018 9:42 AM in response to crazy person

Firefox ESR 52 does support Silverlight but it won't run on Mojave. Keeps saying to install Silverlight and tried reinstalling Silverlight without that helping.

It appears Apple does not want to support most NPAPI applications anymore.

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Answer 3

richdjw Author

Level 1

9 points

Sep 27, 2018 9:46 AM in response to VikingOSX

I understand that Microsoft has stopped development and I understand why its going away on all other browsers other than Internet Explorer. To say its dead is not accurate, but rather its on life support until 2021. But the fact of the matter is it was working yesterday and now its not. There has to be some sort of explanation as Apples documentation doesn't spell out correctly why other browsers can't run Silverlight. It just says THEIR browser won't support it anymore. I'm just looking to see if someone else knows something that I don't about Silverlight completely dead to MacOS Mojave.

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Answer 4

Sep 27, 2018 9:49 AM in response to richdjw

I think this is something to bring up with Silverlight and Firefox. The system is not actively seeking out and destroying silverlight, but it may be unintentionally running into it via Safari.

Check to see if there's a way to install silverlight in a non-standard location, perhaps.

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Answer 5

richdjw Author

Level 1

9 points

Sep 27, 2018 10:49 AM in response to dialabrain

Yes. When we were on High Sierra we installed Firefox 52.1.0 ESR 2 weeks ago after Safari 12 rolled out. We had to go to preferences to turn off automatic updates. I have also turned off automatic updates for 52.9.0 ESR.

Again, appreciate the help as I know this Silverlight application isn't going anywhere anytime soon!

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Answer 6

Sep 27, 2018 8:55 AM in response to richdjw

If the version of Firefox still supports Silverlight, Mojave should not cause any issues. I have not tested it, however there's no reason for it not to work.

Is Silverlight not working?

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