I just downloaded Firefox and it won't open, message "The procedure entry point ?js_NextActiveContent@@YAPAUJSContext@@PAUJSRuntime@@PAU1@@Z could not be located in the dynamic library js3250.dll. What is the problem?

I was trying to update Firefox but could not. I went ahead and downloaded the latest version but it won't open. I tried deleting, and then reinstalling, same problem. I am running AVAST antivirus

See:
* http://kb.mozillazine.org/Browser_will_not_start_up#Procedure_entry_point_js_SaveRegExpStatics__error_in_js3250.dll_after_updating_Firefox

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