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Every few days I am advised I have Version 3.5.16 and to update. I update and then a few days later Firefox reverts back to 3.5.1.6.

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Today I updated Norton's Internet Security and then was advised I did not have an up to date version of Firefox. I do not know if this is relevant as the issue has happened previously without any Norton's update.

Today I updated Norton's Internet Security and then was advised I did not have an up to date version of Firefox. I do not know if this is relevant as the issue has happened previously without any Norton's update.

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Different PC?
You posted here with 3.6.13.

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No the same PC. I am currently using 3.6.13. Without apparently doing anything I get a notice that I am not using the current version of Firefox. I then check and find I am then on 3.5.16. I then update again to 3.6.13.

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