Firefox will not open, extentions updated, tried older versions, had worked before but quit. goog chrome and explorer work great but firefox bombed any thoughts

Windows 7 ultimate, this program worked fine for the last 5 months and all of a sudden just quit. I erased and put on earlier versions all have same outcome. Click on icon and just looks like time clock just spins. No program opens but says program is open.

hello, could you attribute it to any change / update that was applied? some security software like zonealarm could create problems after a firefox update when sandboxing is enabled, see [[Firefox won't start - find solutions]]
also in some cases this behaviour can be caused by malware, so please do a full scan of your system with the security software already in place and possibly with a different tool too.
[[Troubleshoot Firefox issues caused by malware]]

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