Firefox 36.0.1 on Mac running Yosemite 10.10.2 hangs when trying to open Add-ons Manager

I am running Firefox 36.0.1 on an iMac with Yosemite 10.10.2. Firefox is working fine except that it hangs and forces me to Force Quit the application every time I try to choose Add-ons from the Tools menu. I have never had this problem before. This problem has happened for three straight days with my iMac being restarted several times. The same problem happens when trying to access Add-ons from the Open menu icon. Does anyone have a solution? Thanks!

If you put this into the url bar: about:addons
does this also happen? If not, add the icon back and remove it to reset it.
*[[Customize Firefox controls, buttons and toolbars]]
Does it also happen in Safe Mode?
*[[Troubleshoot Firefox issues using Safe Mode]]

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