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When I display document.cookie it includes some cookies I did not set: popunder=yes; popundr=yes; setover18=1 - are these from FireFox?

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I am writing computer lab exercises for a course I'm writing, and the cookies part is not working as expected; then I found those those three unexplained cookies and I wonder how they got there?

I am writing computer lab exercises for a course I'm writing, and the cookies part is not working as expected; then I found those those three unexplained cookies and I wonder how they got there?

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Is it only on your exercises or do those show up other places?

I have a page that I created for some reason that manipulates document.cookie in client-side script. Does it behave oddly for you?

https://www.jeffersonscher.com/res/cook.html

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Chosen Solution

Is it only on your exercises or do those show up other places?

I have a page that I created for some reason that manipulates document.cookie in client-side script. Does it behave oddly for you?

https://www.jeffersonscher.com/res/cook.html

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I looked at your source page; way more complex than my simple page.

But when I tested my page again today, the mysterious behavior is gone!

Don't know why, but I'll take it.

Thanks for your note.