Firefox slows down on certain sites

Something is slowing down Firefox when browsing Facebook, Odnoslassniki and LinkedIn. Sometimes I get an error message of Java not responding but mostly I don't. Watching videos on YouTube from those websites also makes the computer slow down. However, RuTube works fine with hardly any hitches.
This is on a Windows 8.1 laptop with 4GB of RAM.
Things I've done:
-Checked on a laptop of a similar spec and Firefox on that machine doesn't slow down on the same sites, when using the same Wi-Fi network.
-Scanned with Malwarebytes several times over the past week.
-Reset Firefox and used no add-ons. The result is the same.
-Updated Flash player and Java to their latest versions.
I would really appreciate some help in getting Firefox to work smoothly :)

Your System Details shows;
Installed Plug-ins
Shockwave Flash 14.0 r0
Shockwave Flash 13.0 r0
Adobe Shockwave for Director Netscape plug-in, version 12.0.7.148
Adobe Shockwave for Director Netscape plug-in, version 12.0
Having more than one version of a program may cause issues.
Flash is notorious for not cleaning out the older version as part of an update.
Grab the uninstaller from here:
'''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows]'''
'''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac]'''
Then reinstall the latest version.
Update your Shockwave Flash '''v14.0 r0 http://get.adobe.com/shockwave/'''
The link for Flash Player '''v14.0.0.179 http://get.adobe.com/flashplayer/'''

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