Why does Firefox stop responding?

Ever since firefox updated (version 3.1.0) it constantly stops responding. This especially happens when attempting to view a video or pop-up image on sites such as Facebook, The Chive, Youtube, etc. The browser stops responding about every 10 seconds then seems fine after about 40 seconds. This repeats for viewing most videos or pop-ups.
Things I have already tried that has no apparent effect:
Updated Flash to latest version.
Updated Java to latest version.
Disabled all Add-Ons.
Set all Plug-Ins to "Ask to Activate".
Uninstalled custom theme.
Renamed File: places.sqlite to places.sqlite.old.
Any help is appreciated.

As if my original issue was not enough, since the last Firefox update (09-20-14), now my FF completely crashes and gives me the same connection issue error as if I had no ISP at all.
"Firefox can't find the server at www.google.com.
Check the address for typing errors such as ww.example.com instead of www.example.com
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web."
Funny thing is, this complete crash thing happens on all three of my comps since installing the latest FF update. IE and Chrome function without issue. My ISP connection is good and no firewall.
I have completely uninstalled FF, deleted all Mozilla/FF folders, cleaned all temp files/cookies, ran a registry cleaner, rebooted and reinstalled FF.
Still have both issues. The only difference is that now I have zero add-ons and have lost all of my saved passwords. I have been using FF for years and have never encountered such a mess.

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Question
why does Firefox give this message when I do not have another program running or another window open - "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." edit

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Why does Firefox stop responding?

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