Whenever try to close a tab I get a poup stating this error: EXC in ev handl: error: bad npobject as private data

that's about it!

McAfee Site Advisor 3.4.0 just came out of the addons blocklist, and you have SiteAdvisor and even though that is the current; nevertheless, you should uninstall it and reinstall it as noted in https://community.mcafee.com/message/203466 for a fresh version with only current files.
Also refer to http://kb.mozillazine.org/Problematic_extensions relating to McAfee Site Advisor 3.4.0 for more specific instructions.
<br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>

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    *https://community.mcafee.com/message/203466
    *https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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    <br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>

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    *Don't make any changes on the Safe mode start window.
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    * https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
    Start Firefox in Safe Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
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    * https://support.mozilla.com/kb/Safe+Mode

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    *https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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    Please see solution in http://kb.mozillazine.org/Problematic_extensions
    for "McAfee Site Advisor".
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    <br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>

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