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Open just one tab and load NewYorkTimes in it and watch the Activity monitor over time. Then imagine using it regularly as default browser with multiple tabs.
That's interesting! I wonder what it is with the New York Times site that causes the CPU usage to go up so much in Firefox. I mean I have 38 other tabs open and that doesn't make Firefox use that much CPU, but as soon as I go to NY Times CPU usage go up.

I recently switched to Firefox from Safari because I feel Safari as of late becomes sluggish when having many tabs open. Just switching to another tab or closing a browser window in Safari can take a second or two, while it's more or less instant in Firefox (as of version 57 ”Quantum”).

So responsiveness is better in Firefox I think, but of course that sholdn't be at the cost of to much CPU usage. It seems okay for me overall with Firefox, but again I wonder why that NY times site is triggering the high CPU usage. Safari seems cool with it. Hmm… Also wonder if there are other sites that causes the same behavior. Hmmm… again.
 
I've been using FF for quite a while but never noticed the battery drain issue. Then again I only use my rMBP on trips and usually have it plugged in while I use it. Thanks for the tip.

I have been using FF full time on my Macs since v57. It definitely is a bigger drain on battery than Safari is. I usually just switch to Safari if I have to run for any significant amount of time on battery. But when I'm plugged in or just using battery for a small part of the day I'm using FF. Love it.
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Unlike the previous poster, I have a 2015 13" rMBP and ran FF 57. at one point I had 7 tabs open and never heard the fans kick up. AND it was sitting on my lap and not hot, warm yes but not hot.

I use it full time on my Macs (MBPs). There is only one website I visit routinely that seems to cause an issue.
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TAlso wonder if there are other sites that causes the same behavior. Hmmm… again.

There are. I regularly read gearslutz.com (music production site) and it always causes higher CPU use from FF.
 
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Add support for the P3 gamut, please! Colors still look over-saturated and inaccurate. Chrome took a long time to add P3 support, but they did eventually. I hope Firefox will too.
I don't have the hardware to check myself, but that would imply the comment here is incorrect:
https://bugzilla.mozilla.org/show_bug.cgi?id=1284861

Are you sure it is lacking P3 gamut support?

See also the test page here:
https://webkit.org/blog-files/color-gamut/

Sometimes there are JPEG encoding issues here. Firefox also doesn't seem to support ICC V4 either on Windows or Mac, only V2. It could be this that's an issue too. (wow, 9 year old bug too, "This has taken the shine off the launch of Firefox 3.5 for me.", lol...)
 
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I've used Firefox for years. It's my favorite browser by far. I especially like its bookmark management compared to other browsers. I've never had it ramp up the fan on my MBP or any other laptop I've owned. The only time I use Safari is to watch Apple's online events. I'm very happy it's still being supported and improved.
 
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I've used Firefox for years. It's my favorite browser by far. I especially like its bookmark management compared to other browsers. I've never had it ramp up the fan on my MBP or any other laptop I've owned. The only time I use Safari is to watch Apple's online events. I'm very happy it's still being supported and improved.
My sentiments and usage to a T.
 
I had not opened FireFox in years so instead of downloading it from their site, I opened it and went to the preferences and clicked "update" which triggered an update and refresh button in the main window

It restarted and then I had to go to the about screen and subsequently went through 3 updating and restart cycles before finally "you're on the latest version" and for real this time because after every relaunch, the launch page on the FF website said "you're on the latest version" while the about screen was downloading yet another update.

After 10 minutes of this and 250 megabytes of downloads across 4 different versions, I really should have just downloaded the latest from FF's website and replaced the current app.


What an odd update situation. why wouldn't the browser just query what the latest is and update that?
 
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I have to use Firefox and haven't had any issues with it. It works better than Safari - even Chrome does.
Safari is really outdated. On PayPal I constantly get "fatal error" on some places such as in "history" tab and besides my ID card won't work with Safari and I can't log in to my bank account etc…
Safari doesn't even support 360 video. Apple should really fix Safari.
 
I don't have the hardware to check myself, but that would imply the comment here is incorrect:
https://bugzilla.mozilla.org/show_bug.cgi?id=1284861

Are you sure it is lacking P3 gamut support?

See also the test page here:
https://webkit.org/blog-files/color-gamut/

Sometimes there are JPEG encoding issues here. Firefox also doesn't seem to support ICC V4 either on Windows or Mac, only V2. It could be this that's an issue too. (wow, 9 year old bug too, "This has taken the shine off the launch of Firefox 3.5 for me.", lol...)

Just did the test on 2016 MBP: it fails it. The sRGB image and the P3 image look identical on Firefox, but not on Safari and Chrome.

So it seems that comment is incorrect :p Unless that's referring to the Windows version? I wouldn't know about Windows, but it doesn't support it on Mac.
 
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I don't have the hardware to check myself, but that would imply the comment here is incorrect:
https://bugzilla.mozilla.org/show_bug.cgi?id=1284861

Are you sure it is lacking P3 gamut support?

See also the test page here:
https://webkit.org/blog-files/color-gamut/

Sometimes there are JPEG encoding issues here. Firefox also doesn't seem to support ICC V4 either on Windows or Mac, only V2. It could be this that's an issue too. (wow, 9 year old bug too, "This has taken the shine off the launch of Firefox 3.5 for me.", lol...)
On my nMP with a Dell Ultrashop monitor, FF 58 does show a difference between the sRGB and the P3 gamut. It is not a substantial difference but definitely noticeable. That tells me some of the failures may be related to monitors used and not FF
 
I disagree... I actually love the interface. I guess to each their own.

Everyone has their own preferences. I used to love the original Firefox look back in the 3-4 days and I had a theme which gave it the Mac aqua look which I found really cool at the time. Some people like the flat look in vogue right now and others prefer skeuomorphic and the 3D dock design.

Now I prefer the minimalist Safari look. I used to hate Safari on Windows when it first launched but after using it for a decade on iOS and now for a year on the Mac, I’ve grown to love its look and simplicity.
 
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Just did the test on 2016 MBP: it fails it. The sRGB image and the P3 image look identical on Firefox, but not on Safari and Chrome.

So it seems that comment is incorrect :p Unless that's referring to the Windows version? I wouldn't know about Windows, but it doesn't support it on Mac.
Firefox on my iMac displays images correctly. They fixed the incorrect wide-gamut behavior in 57. I would check your config settings to see if they're correct. You can see the bug report here: https://bugzilla.mozilla.org/show_bug.cgi?id=1250461

That said, video color behavior is still off. But at least stills have been fixed.
 
What iMac do you have? Did you use the test provided in Northgrove’s link? The images labeled "P3" and "sRGB" should appear different: the Iceland sunset images show it most clearly.

I’m not saying I don’t believe you, but I’d like to know why my laptop seems to be the exception here when I’m just using the default settings and haven’t changed anything. What settings should I adjust?
 
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Always been a fan of Firefox and its add-on customizability. Right now, its my main on Linux, and its a backup for my iMac (Safari being default simply because it is way faster). Haven't had any of the fan issues running Safari, Chrome, Firefox, any browser really. Guess I'm not as much of a power user as some others here.
 
There are. I regularly read gearslutz.com (music production site) and it always causes higher CPU use from FF.
I wonder if Mozilla is aware of those CPU consuming sites (i.e. if it has been reported as a problem). Feels like it's something they should look into. Because I really think Firefox works very well now otherwise.
 
What iMac do you have? Did you use the test provided in Northgrove’s link? The images labeled "P3" and "sRGB" should appear different: the Iceland sunset images show it most clearly.

I’m not saying I don’t believe you, but I’d like to know why my laptop seems to be the exception here when I’m just using the default settings and haven’t changed anything. What settings should I adjust?
Late 2015 5K iMac. Yeah I used Northgrove's link and the sRGB and P3 images are different.

In your about:config in Firefox, make sure gfx.color_management.mode is set to 1.

Other than that, I don't know what else to say. Maybe try doing a factory reset of Firefox. (Although after the reset, I would change gfx.color_management.mode to 1. The default is 2, which only color manages tagged images. 1 manages everything.)
 
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^Thank you! It was set to 2. Changing it to 1 fixed the problem :D
Awesome! They really need to change the default value. The current default doesn't make sense anymore. I had completely forgot I even changed it a while back until I looked up the value today.
 
Still loads everything you throw at it. Still loads everything quickly. Still looks like complete and absolute garbage. Can Mozilla not find a single contributor with GUI experience that has even trace amounts of visual taste?
 
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