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

Question

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?

Answer 1

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