Firefox always hangs. Spinning Beach Ball appears. Must Force Quit repeatedly. Have re-installed and refreshed with no change. How to fix?

Every time firefox is launched, the spinning beach ball appears, sometimes immediately, sometimes within a minute or two, every time. Must force quit. I have re-installed Firefox and also have refreshed with no change. Unless this is fixed, Firefox is unusable. I am running OSX 10.9.5 on a 17" MacBook Pro.
I cannot access any information through Firefox, because t always hangs.

Could you test in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]].
''If Firefox is not running:'' Hold down the option key when starting Firefox.
''If Firefox is running:'' You can restart Firefox in Safe Mode using either:
* "3-bar" menu button > "?" button > Restart with Add-ons Disabled
* Help menu > Restart with Add-ons Disabled
and OK the restart.
''Both scenarios:'' A small dialog should appear. Click "Start in Safe Mode" (''not'' Refresh).
Any less crashy?

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