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I can't open Firefox and I can't uninstall it. What do I do?

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When I try to open Firefox I get this message: "couldn't load XPCOM." Also I am unable to uninstall Firefox - when I click uninstall nothing happens.

When I try to open Firefox I get this message: "couldn't load XPCOM." Also I am unable to uninstall Firefox - when I click uninstall nothing happens.

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The solution for this problem is stated here :

https://support.mozilla.org/en-US/questions/1029239
One more here : http://appuals.com/best-fix-couldnt-load-xpcom/