Firefox has a total cookie isolation by default now. I would like to see what cookies websites can see from their POV when this is not enabled.
Is there a website similar to https://deviceinfo.me or https://coveryourtracks.eff.org/ that shows this?
Websites can only access cookies that they themselves set regardless of total cookie protection. The problem arises when a third party (such as google ads) is present on multiple websites and sets a cookie on one site before reading it back on another, linking your activity between the two. Total cookie protection isolates these third-party cookies by first-party site, so google ads cannot read back a cookie on site B that it set on site A, even though google ads is present on both.
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There are several extensions to view (and edit) cookies. I like this one Cookie Manager – Get this Extension for 🦊 Firefox Android (en-US)