#19037: Suppress content access to page visibility API
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Reporter: arthuredelstein | Owner: tbb-team
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Applications/Tor | Version:
Browser | Keywords: tbb-linkability,
Severity: Normal | TorBrowserTeam201605
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
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The `document.visibility` property and the `visibilitychange` event let
content know if the user has selected or deselected a tab. If the user
switches from tab A to tab B, then tab A can observe a "hidden" event at
the same time that tab B receives a "visibile" event. So it seems
potentially useful to suppress this information.
See https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19037>
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