Why does my Firefox continue to hang?

I've really had it up to here with Firefox hanging/freezing. Just like many others have posted in the help forums, after leaving my browser open for a few days, Firefox begins to hang every 10-12 seconds, for a few seconds at time. It doesn't matter how few windows/tabs I have open -- I can have a single window open with no "history" (i.e. opening a link in a new window then closing every other window) and my memory usage is still up around 800M. When it hangs, the CPU shoots up to 50%.
I'd like to make it clear I'm not an add-on fanatic, I like to run minimal. I've only installed the following extensions: AdBlock Plus, LogMeIn, Scrollbar Anywhere, 20-20 3D Viewer (with Quick Restart, Java Console and Java Quick Starter disabled). I've gone through and disabled EVERY PLUGIN to no avail. I'm running it right now with all plugins disabled and it's continuing to hang as I type this. I'm so, so sick of having to constantly restart Firefox to fix this issue. The only thing that looks suspect in my Troubleshooting Info is the amount of printer-related Modified Preferences, but I'm not sure why this would cause hanging only after being open for a few days. Thank you.

Is it possible to start Firefox in Safe Mode, I do understand that the frequent crashes are disrupting and after a crash that Firefox will not open, you need to restart the computer.
In about:config are there any changed about:config entries related to the crash report: browser.sessionstore.resume_from_crash
However in the meantime I will see what I can find.

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OS: Ubuntu 14.04 - fully updated
Mozilla Firefox 33.0 (Info via Terminal since Firefox is stalled)
Plugins: Zotero, AdBlock Plus, Print edit, Download Helper (from memory since FF is stalled)
I use Thunderbird 31.2.0 for email - Firefox DOES NOT bring Thunderbird down with it when both are running
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Why does my Firefox continue to hang?

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