Firefox Locks Up And Is "Not Responding" A Lot

This has been going on for years. When I have 3 or 4 tabs, especially facebook open, and am watching a youtube video Firefox freezes up a lot. I just dealt with it but I'm starting to get sick of it. The only addons I use are DownloadHelper and AdBlock Plus. I have a lot of plugins disabled. I don't know what is causing this but I just checked on my CPU Usage and Firefox was using 266,000+ K and that's not counting Flash, which was using 70,000+ K. Someone please help me fix this extremely irritating issue.
PC Details:
Windows 7 Home Premium (32 Bit)
3.00 GB RAM
2.10 GHz AMD Phenom Triple Core Processor

I have followed the troubleshooting solutions, reset, no add-ons etc.. even full uninstall & reinstall. Nothing has worked to resolve the issue.
FF hangs with Not Responding is frequent, while this is hung, it locks up my entire PC and I cannot do anything including opening Task Manager.
My Workstation Specs:
OS: Microsoft Windows 8 Pro 64-bit
CPU: AMD FX-8350 Vishera 32nm Technology
RAM: 32.0GB Dual-Channel DDR3 @ 669MHz (9-9-9-24)
MB: ASUSTeK COMPUTER INC. M5A99X EVO R2.0 (Socket 942)
Graphics: 47LV4400 (1920x1080@60Hz) 2048MB GeForce GTX 660 (ASUStek Computer Inc)
HDD: 224GB TOSHIBA MKNSSDCR240GB ATA Device (SSD)
699GB Seagate ST750LX003-1AC154 ATA Device (SATA)
BluRay: PIONEER BD-RW BDR-208D ATA Device
Audio: Realtek High Definition Audio

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Update all your plugins (Flash, Java, etc.): [http://www.mozilla.org/plugincheck/ http://www.mozilla.org/plugincheck/].
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Firefox Locks Up And Is "Not Responding" A Lot

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