Firefox is repeatedly overloading my CPU

My problems with high CPU usage by Firefox started a few weeks ago. Here are the fixes I've tried so far:
quitting firefox and opening new browser window: helps briefly, but screen freezes start again within a minute or two, sometimes right away
restarting computer: doesn't help any more than quitting and restarting firefox
clearing cache and history: did not help (have done this repeatedly)
disabling extensions: did not help
updating firefox again: did not help
uninstalling firefox, removing all hidden folders, clean reinstall: seemed to fix problem initially, but after a few days, I'm right back where I started
running firefox --debug with gdb installed: gdb found no debugging symbols
turning off chat in Facebook: did not help
I am currently running Firefox 10.0.2 with Linux Mint 9 (Isadora). My configuration is x86_64-linux-gnu. I generally keep browser tabs open for email, Words with Friends (my only regular use of Facebook) and Ravelry, with one or two other tabs open as needed for other tasks.
Possibly useful information from my system information summary:
Processor : 4x Intel(R) Core(TM) i3 CPU, 550 @ 3.20GHz
Memory: 5922MB (1268MB used)
Since the clean re-install of Firefox, I have only added one extension (Add to Search Bar 2.0) and re-imported my bookmarks list. The other extension and add-ons (which I presume came with the install) include Ubuntu Firefox Modifications 0.9.3, IcedTea Web Browser NPR Plugin, iTunes application detector, and Shockwave Flash 11.1 r102. Just for grins, I tried disabling them all again, and it made no difference. All system updates are current. I've been keeping my system monitor open and each time my browser freezes, I'm seeing 100% CPU usage by Firefox (actually, as high as 120%, although I don't know how that is possible).
Any other suggestions? I'm really motivated to keep using Firefox, but I'm not sure what else to try.
Thanks.

I am not sure I can help much here, but obviously the spec of your machine exceeds the requirements, and so I would not expect such high CPU use.
I realise malware is probably not a big problem in linux, but as you notice no problems on a clean re-install
clean reinstall: seemed to fix problem initially, but after a few days, I'm right back where I started
and have tried to rule out other causes maybe you should also consider a possibility of a malware problem.
See also
* [[is my firefox problem a result of malware]]
* [[firefox consumes a lot of CPU resources]]

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this problem been going on for at least 3 months so it is cross version of Firefox as I've updated recently to 17.
after a while, I think it's 1.5-2hr if I've been surfing .. doing stuff on MacBook.. andcfirefox been open entire time
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The NTVDM CPU has encountered an illegal instruction

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* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
* Trash the current Firefox application to do a clean (re-)install
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* https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
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Crash ID: bp-f73084f5-ab22-477f-9f06-157252150128
Crash ID: bp-db1d84ab-299e-4da6-9a9a-17ee92150128
Crash ID: bp-df667f2e-a0b6-4061-b6ce-3bb082150128
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'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from [https://www.mozilla.org mozilla.org] (or choose the download for your operating system and language from [https://www.mozilla.org/firefox/all/ this page]) and save the setup file to your computer.
#After the download finishes, close all Firefox windows (or open the Firefox menu [[Image:New Fx Menu]] and click the close button [[Image:Close 29]]).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

Firefox crashes repeatedly. please helpe

Firefox crashes repeatedly
Crash ID: bp-0d558271-ea4d-42ca-b561-528c02131003

'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
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[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
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Run all Windows Updates, install all needed service packs, etc.
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Download and Install MalwareBytes Anti-Malware, run a full Scan. [http://www.malwarebytes.org/ http://www.malwarebytes.org/]. This helps check that there are no viruses on your computer causing issues. you can uninstall this program after you clean off any infections.

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Version utilisée: 3.16.5 Basic ECC
NSSUTIL
Version minimale attendue: 3.16.5
Version utilisée: 3.16.5
Fonctionnalités expérimentales
------------------------------

It doesn't help, has i said : i allready do standard procédure to help (what you point) : update to lastest, disable extension or theme (i do not use), disable plug-ins... nothing helps, the bug is still there.

X overload my cpu

/usr/bin/X -br -nolisten tcp :0 vt7 -auth /var/run/xauth/A:0-3Wj8Pl 95% CPU 6.3% mem time 8h
After some hours this process overload my cpus. I can do ctrl+alt+f[1-6] but X is frozen.

Right now, I see that even previous version (Pages '09) have a problem with eating process too.
So I guess that I have too many fonts. Since I have installed a bunch of fonts.
I have removed 2 critical font problems but pages still eating process.
BUT I have validate fonts and I have about 300 fonts with minor issue.
This could be a problem with pages but not sure why other app has no problem with this at all.
So now I am renaming them to fix the issue each font then will see if problem solve.

Mozilla Firefox crashes repeatedly in ubuntu 12.04 desktop version now what to do to solve this problem?

Mozilla Firefox 20.0 crashes repeatedly
I had tried by disabling cookies, addones uninstall & reinstall firefox completely
after that problem still exists.
at anytime it crashes. & we have to restart Firefox.

* It could be helpful if there is a diagnostic program/add-on which control all
installed add-ons.
* It could even be helpful If I can type/write more as 1500 characters in a
message, because I have to tell my story (Mozilla problems) and I want to
place the output of the 'terminal' (Sessionstore) in the same message.
* It even shall be helpful if there is a list (like in the early days of the Windows-
browser), where I can find the description and/or the solution of the Firefox- errors. My terminal give me p.e. this output : (firefox:10353): Gtk-CRITICAL
**: IA__gtk_clipboard_set_with_data: assertion `targets != NULL' failed;
Firefox: 10353 says me nothing, so..... there are errors enough, but the
crashes don't come from the browser. I have taken all steps, my last is to
re-install FF24 about:blank, vdpau.... e.s.o
* If I place a message here I can only put a picture-file, not a text or Gedit-file.

When starting Firefox 3.6.11 the CPU goes to 100%.

After upgrading from 3.6.10 to 3.6.11 I'm unable to start Firefox in a reasonable period of time (3 minutes). The CPU goes to 100% for one of my 4 cores, when left to its own, the Firefox window appears after 18 minutes 43 seconds. My CPU is a Q6700 (Quad 2.66Ghz).

How can I go back to 3.6.10??

Firefox using a lot of CPU (90%+ at times)

I am running firefox version 26.0 on a Macbook Pro OS X version 10.6.8 and I am running these extensions http://i.imgur.com/Co4NlGQ.png and http://i.imgur.com/Co4NlGQ.png . I am also using these plugins http://i.imgur.com/ZO55Lmq and http://i.imgur.com/IapcvJY and I have disabled all of the plugins, and that did not help as the CPU usage still fluctuated from about 10% usage all the way up to 100%.
I have checked to see if the plugins are up to date, and I updated one of them, but the newest Java Applet Plugin update only works with Maverick, which I do not have. Quicktime says that it's not up to date, but when I checked the software update on my Mac, it says that there are no updates available.
Image of the plugins that I checked to see if they were up to date http://i.imgur.com/fPuV8vD and http://i.imgur.com/7Uwp5vX and http://i.imgur.com/N0Cz9Tp aaand http://i.imgur.com/6FIwVTv .
Here is an image of my activity monitor (I had all plugins disabled here) http://i.imgur.com/j6xUudo . As you can see, the CPU usage is 99.6%, which is staggering considering I only opened a webpage (reddit) and was not running videos and the like. And here's an image of my activity monitor with more information http://imgur.com/zuY5iMu . The Real Mem can go all the way up the 2 GBs, which is a bit worrisome.
I have tried resetting Firefox, which didn't help, I have tried starting FF in safe mode, which didn't help, and I have even tried reinstalling FF, which didn't help. I also tried disabling "using hardware acceleration," restarted my computer, and the issue was not fixed. I used CCleaner to clear temporary files and the like, but it didn't do any good.
I really want to be able to use Firefox, because I'm starting to distrust Chrome, but if FF is using that much memory and CPU, I'm not sure I can continue using that browser.
I feel like I've hit dead ends on everything that I've tried, so I'm starting to give up hope. Does anyone help any idea or suggestion as to what I should try/ do?

I just realized that I just gave the information for the browser without the extensions that I had installed. Here's the accurate Troubleshooting Information with the extensions:
Hopefully that is of some help.
Application Basics
Name: Firefox
Version: 26.0
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:26.0) Gecko/20100101 Firefox/26.0
Extensions
Name: Adblock Plus
Version: 2.4
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Name: BetterPrivacy
Version: 1.68
Enabled: true
ID: {d40f5e7b-d2cf-4856-b441-cc613eeffbe3}
Name: Dictionary Extension
Version: 3.0.12.1
Enabled: true
ID: jid0-raWjElI57dRa4jx9CCiYm5qZUQU@jetpack
Name: Ghostery
Version: 5.0.6
Enabled: true
ID: [email protected]
Name: Gmail Checker
Version: 2.6.3
Enabled: true
ID: {6BFD307A-C040-11DA-9749-FB1C850B47DF}
Name: HTTPS-Everywhere
Version: 3.4.3
Enabled: true
ID: [email protected]
Name: LastPass
Version: 3.0.12
Enabled: true
ID: [email protected]
Name: Reddit Enhancement Suite
Version: 4.3.1.2
Enabled: true
ID: jid1-xUfzOsOFlzSOXg@jetpack
Name: Search by Image for Google
Version: 1.2.0
Enabled: true
ID: {ab4b5718-3998-4a2c-91ae-18a7c2db513e}
Name: Socialite
Version: 1.5.1
Enabled: true
ID: socialite@chromakode
Name: Thumbnail Zoom Plus
Version: 2.6
Enabled: true
ID: [email protected]
Name: Tube Enhancer Plus
Version: 2.7.2
Enabled: true
ID: [email protected]
Name: WOT
Version: 20131030
Enabled: true
ID: {a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}
Name: null
Version: 8.0.6
Enabled: false
ID: [email protected]
Important Modified Preferences
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.places.smartBookmarksVersion: 4
browser.sessionstore.upgradeBackup.latestBuildID: 20131205075310
browser.startup.homepage_override.buildID: 20131205075310
browser.startup.homepage_override.mstone: 26.0
dom.mozApps.used: true
extensions.lastAppVersion: 26.0
gfx.blacklist.webgl.msaa: 4
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1388458622
places.history.expiration.transient_current_max_pages: 100664
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 0
storage.vacuum.last.places.sqlite: 1388458622
Graphics
Device ID: 0x 8a0
GPU Accelerated Windows: 1/1 OpenGL
Vendor ID: 0x10de
WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce 320M OpenGL Engine
windowLayerManagerRemote: false
AzureCanvasBackend: quartz
AzureContentBackend: quartz
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.2
Version in use: 4.10.2
NSS
Expected minimum version: 3.15.3.1 Basic ECC
Version in use: 3.15.3.1 Basic ECC
NSSSMIME
Expected minimum version: 3.15.3.1 Basic ECC
Version in use: 3.15.3.1 Basic ECC
NSSSSL
Expected minimum version: 3.15.3.1 Basic ECC
Version in use: 3.15.3.1 Basic ECC
NSSUTIL
Expected minimum version: 3.15.3.1
Version in use: 3.15.3.1

Firefox is repeatedly overloading my CPU

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