[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:
-------------------------------------+--------------------------
Changes (by cohosh):

 * status:  new => assigned
 * cc: cohosh, phw (added)
 * parent:   => #27385
 * owner:  (none) => cohosh


Comment:

 We refactored the proxy implementation in the process of adding a
 webextension (#23888, #30934). A part of this refactor was to not rely on
 the use of cookies for the webextension. We can probably just apply that
 refactor here, along with other changes to spruce up the look of the
 snowflake badge.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28917#comment:2>
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