[tor-bugs] #28917 [Circumvention/Snowflake]: Delete the proxy opt-in cookie, don't set it to 0

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#28917: Delete the proxy opt-in cookie, don't set it to 0
-------------------------------------+--------------------------
 Reporter:  dcf                      |          Owner:  cohosh
     Type:  enhancement              |         Status:  assigned
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:  #27385                   |         Points:
 Reviewer:                           |        Sponsor:
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Comment (by cohosh):

 Replying to [comment:5 dcf]:
 > I think there's value in having a web page that people can visit to
 become a proxy without having to install an extension. The distributed-
 badge thing is comparatively much less useful. I agree that of the
 possibilities, the WebExtension has the most promise and should be
 prioritized.

 Okay after looking at this a bit, I'm not sure we can use `local.storage`
 outside of the extension context so we'll probably have to use cookies
 anyway. I'll see what I can do to apply the refactors that were used in
 the webextension implementation to the badge with the only difference
 being checking the cookies instead of storage.

 And then the next steps are:
 - UI overhaul of the badge (#27385) using the design decisions made in the
 webextension
 - UI overhaul of the [snowflake.torproject.org] site

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28917#comment:6>
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