I constantly get the message "uninstal set javascript application since downloading new version of Firefox today - how do I get rid of this

I downloaded the new version of Firefox today and ended up with the error box or message -javascript application - uninstall set. I cannot get rid of it and it appears with every key stroke. It's on everything I use on Firefox.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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