Firefox is incredibly choppy and sluggish on a new computer. Why is this happening?

Question

I bought a brand new laptop a few weeks ago. For some reason, Firefox is very choppy and slow, especially when I'm scrolling on websites. I noticed there are more problems when I am websites with a lot of image/video content such as Facebook. The weird thing is, when I use other browsers, it seems to work just fine (no laggy UI, no choppy scrolling).
This problem is incredibly annoying and I have been dealing with it for the last few weeks. My guess is it has to do with Windows 8.1 - I'm ready to just give up after trying all other fixes. I have even started my browser up with all Add-Ons disabled. The issue is still there. The only add-on I am running is Adblock.
Thanks.
Specs: Lenovo Yoga 2 Pro - Intel Core i5-4210U CPU @ 1.70 GHz 2.40 GHz
RAM- 8.00 GB
Version of Firefox - 36.0.4

Answer 1

Application Basics
Name: Firefox
Version: 36.0.4
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: Adblock Plus
Version: 2.6.8
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Graphics
Adapter Description: Intel(R) HD Graphics Family
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter RAM: Unknown
Device ID: 0x0a16
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.17111)
Driver Date: 3-11-2014
Driver Version: 10.18.10.3496
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 397817aa
Vendor ID: 0x8086
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics Family Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0
Important Modified Preferences
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 1
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20150320202338
browser.startup.homepage: www.google.com|https://mail.google.com/mail/u/0/#inbox
browser.startup.homepage_override.buildID: 20150320202338
browser.startup.homepage_override.mstone: 36.0.4
browser.tabs.warnOnClose: false
dom.mozApps.used: true
extensions.lastAppVersion: 36.0.4
font.internaluseonly.changed: false
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-gmpopenh264.enabled: false
media.gmp-gmpopenh264.lastUpdate: 1426134560
media.gmp-gmpopenh264.version: 1.3
media.gmp-manager.lastCheck: 1427409938
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1427424092
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.npmeetingjoinpluginoc: 0
plugin.state.npspwrap: 0
plugin.state.npthinkorswim: 0
plugin.state.nptossc: 0
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1426138322
Important Locked Preferences
JavaScript
Incremental GC: true
Accessibility
Activated: true
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7
NSS
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC
NSSSMIME
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC
NSSSSL
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC
NSSUTIL
Expected minimum version: 3.17.4
Version in use: 3.17.4
Experimental Features
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