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Tenashus1

macrumors 6502a
Original poster
Jul 27, 2011
501
287
2015 MacBook heating up with latest Firefox. Not really sure why. Anyone possibly have a guess?
 
Computers need energy to do work. Its CPU is an information engine, like the engine in your car is a mechanical engine. In doing work they both get warm. The waste heat you feel is normal.

The computer manages its heat all by itself, much like your car. You don’t need to be concerned. It will shut down before it damages itself. About the only thing you should do is to make sure the fans are free of dust and airflow is not impeded.
 
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I'm not sure I was clear enough in my original post. A message keeps coming up saying to shut down Firefox to help cool the machine. Don't know where that is coming from or why. Never happened before. The MacBook has no fan.
 
I'm sorry. I have never heard of a dialog directing the user to shut down a particular app. That seems suspiciously weird to me. Can you grab and post a picture?
 
Will try. Used Malwarebytes and found two baddies recently. But got rid of them. Never seen this kind of pop up before myself.
 
Never heard about such a popup window either, and surprised about it as well.

Have you checked the temperature of the CPU ?
You could use an Application like iStat, if you do not have it already. Compare what you see with and without firefox.

Regarding to firefox, I found it was often using much more resources (CPU and energy) than other browsers, so I almost do not use it on laptops now. So, even if the message is weird, there may still be something about FF.
 
Can you take a screenshot of that message and post it here? I've never seen anything like this, and I'm almost 100% certain that neither macOS nor Firefox itself issue warnings like these.
 
I'm sorry. I have never heard of a dialog directing the user to shut down a particular app. That seems suspiciously weird to me. Can you grab and post a picture?
Can you take a screenshot of that message and post it here? I've never seen anything like this, and I'm almost 100% certain that neither macOS nor Firefox itself issue warnings like these.
This happens when certain websites are using a lot of CPU. Not sure if it's the app itself or macOS but you will get a message saying that if you shut this page down, it will save energy.

This happens mainly with dicey websites. For example, some of them use your browsers to mine cryptocurrencies without your permission.

https://www.scientificamerican.com/...natives-a-guide-to-ldquo-cryptojacking-rdquo/

If this is happening, the easy solution is not to use those websites. Or if you must use them, you can use a mining blocker.
 
This happens when certain websites are using a lot of CPU. Not sure if it's the app itself or macOS but you will get a message saying that if you shut this page down, it will save energy.
Those I am familiar with. What I am not familiar with is the following:

A message keeps coming up saying to shut down Firefox to help cool the machine.

Never seen that before.
 
Here finally is a screenshot of the message I keep getting:


Screen Shot 2018-07-25 at 7.41.04 PM.png
 
Like I said before this does not look like it's coming from either Firefox or macOS itself.

Do you have some sort of temperature monitoring software installed? Any tuneup tools that promise to make your system 150% faster for a nominal fee?
 
Like I said before this does not look like it's coming from either Firefox or macOS itself.

Do you have some sort of temperature monitoring software installed? Any tuneup tools that promise to make your system 150% faster for a nominal fee?

No. Just a stock system. Wait, I do have an iStat Pro widget installed. Maybe that's doing it. I don't think so, but maybe. It's been there for a long time before this started happening.
 
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