[tbb-bugs] #29451 [Applications/Tor Browser]: document.body must not return null at document_end state

[Tor Bug Tracker & Wiki]

#29451: document.body must not return null at document_end state
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 Reporter:  cypherpunks               |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Major                     |     Resolution:
 Keywords:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by cypherpunks):

 A proof that this is a bug
 https://github.com/Tampermonkey/tampermonkey/issues/485

 'run-at document-end'
 https://user-images.githubusercontent.com/1324510/34437603-bed9b25e-ecda-
 11e7-9fda-202e413a25db.png

 Where's bugzilla report?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29451#comment:2>
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