Firefox using almost 100% CPU - hogging resources - hanging

After several hours of operating Firefox starts using almost 100% CPU - with peaks of 100% occurring in rapid succession - FF hangs until CPU useage drops below 100%
Followed recommended troubleshooting as recommended on this site:
* Started in Safe mode - no problems occurred.
* Disabled all extensions; Plug-ins left operating.
* No replication of problems.
* Enable 1/2 of extensions up to Flashblock - restarted - seems ok
* Enable most remaining extensions
* (There are 3 Java extesnions - only enabling one) - again seems ok
* Some hours later - problem reoccurred. Each time CPU useage peaked at 100% (according to Task Manager) the Firefox Window flickered & was unresponsive.
* Deleted cache - no change
* Disabled recently added programs - no change
FF opens and closes normally & completely. '''Problem only seems to occur after FF has been operating for some time'''
This has occurred intermittantly before but has become chronic over the last few days. Apologies if I've been repetitive or explained poorly - FF has hung several times while typing this.

No issue for me, after 4 loops my CPU load was around 18%.
Firefox 33.1.1 under Windows Vista.

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Sorry. I did a search, and a lot of threads came up. The one I chose, I thought, explained WHY it happened.
Maybe you'd get answers more helpful to you, if you went throught the search results.
Sorry I wasn't of any assistance.

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Dheart wrote:
signor_rossi wrote:
schivmeister wrote:this is a flash issue
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Hello Kr.
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#update your modem/router software. There have been some reports that some modem/router software may cause Firefox and other browsers to loose performance and/or stability. If updating doesn't fix your issue, try other versions of the software, if possible. If you need support with this, contact your modem/router manufacturer. If this doesn't help, proceed;
#clean up your OS registry, using appropriate software. Make sure you've followed my instructions correctly, but if this all doesn't work, [http://support.mozilla.com/en-US/kb/Managing+profiles create a new Firefox profile] (this can be temporary, of course) and see if the issues persist. Report here the results, so we can't help you further.

I cannot watch Flash vids because Firefox uses too much CPU.

Firefox has become untenable because it uses too much CPU and disrupts Flash videos.
I've tried disabling or changing the values of plugins. Installing older versions. Nothing helps. It just sucks. It makes me want to pull someone's lungs out.

Everyone has this problem, since Firefox rigged one of its Plug-ins (something to do with crash reports) about 06 months ago, to max out CPU, thereby sabotaging computer performance (including Flash videos).
Why or how they haven't fixed it before now strains belief. I have seen the same complaint everywhere. It is a major fuck-up. People want to abandon Firefox in droves, except that none of the other browsers have decent add-ons like pop-up blocker.
Sort it out, Firefox.

Premiere Pro using over 100% CPU

When I open up Premiere Pro, it is using about 6.5% CPU. I can cut, move around in the timeline and add effects ok. But when I play the video (even if its just one track with no effects) my computer starts running very hot and Premiere starts using over 500% CPU. the CPU cores heat to the 90s Celsius. Below are some specs, let me know if you need more to help answer. Thanks!!!
MacBook Pro
OS X 10.9.4
2.2 GHz Intel Core i7
Memory 4 GB 1333 MHz DDR3
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First of all, I strongly recommend that you update to 6.0.5. You'll reap the rewards of many bug fixes. I won't venture whether that alone will help with the temperature.
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The type of video, namely the codec. Those that use interframe compression are much more processor-intensive than intraframe compression.
the resolution, or pixel dimensions, of the video: higher resolution = more pixels = more work
the number of layers in your sequence. And be aware that if you're using nested sequences, you need to include all the layers in each of them.
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Every 2 mins (cca) one core of the CPU gets busy with firefox process. I've tried to uninstall and reinstall whole firefox but without success. I have removed all unnecessary ad-ons I had. Although last one I have added was Firebug (cca one month ago)[the issues begin cca one week ago].

Every 2 mins (cca) one core of the CPU gets busy with firefox process. I've tried to uninstall and reinstall whole firefox but without success. I have removed all unnecessary ad-ons I had. Although last one I have added was Firebug (cca one month ago)[the issues begin cca one week ago].

Why is Firefox using 50%+ of cpu activity and the longest time

Checking Task Manager after frequent slowdowns and almost cont. disk activity ,I found in a 100h system idle time the highest user is firefox at 4h and 1.2million I/O writes. This happens after periods of not using the machine (left on) . At times it hogs all the resources even after just waking up the display with screen rewrites taking seconds and with no requested net activity. This can also happen in the background.

Best to post in the macbook pro forum
Direct you to the proper forum for MacBook :
MacBook Series Forumshttps://discussions.apple.com/community/notebooks?view=discussions
Mac OS X Forums
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro
We are not notebook users.
What does Activity Monitor show for process that are the most active running?
There is an Apple article or user tip on what can cause battery drain, like those on the RIGHT "More like this"

Firefox pauses, consuming 100% cpu while viewing the L.A. Times web site.

Loading www.latimes.com firefox will soon pause while it consumes 100% of the cpu. This periodically goes away but the frequency of 100% loading increases until it barely normalizes.
This behavior persists after loading another web site. This also happens on Linux without Flash installed. Both machines I use are 64 bit, one with Vista and one with OpenSuSE.
I back reved to 3.6 and saw the same behavior. I haven't tried 3.5.
I emailed LA Times support since this behavior is recent, within the last few weeks, but have heard nothing back.

Loading www.latimes.com firefox will soon pause while it consumes 100% of the cpu. This periodically goes away but the frequency of 100% loading increases until it barely normalizes.
This behavior persists after loading another web site. This also happens on Linux without Flash installed. Both machines I use are 64 bit, one with Vista and one with OpenSuSE.
I back reved to 3.6 and saw the same behavior. I haven't tried 3.5.
I emailed LA Times support since this behavior is recent, within the last few weeks, but have heard nothing back.

Firefox using almost 100% CPU - hogging resources - hanging

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