Bug#910880: reportbug / dump-addons-info takes forever

[積丹尼 Dan Jacobson]

Package: firefox
Version: 62.0.3-1

This takes forever thus one cannot use reportbug.
  |       |-reportbug /usr/bin/reportbug --template firefox
  |       |   `-handle_bugscrip /usr/share/reportbug/handle_bugscript 
/usr/share/bug/firefox/script /tmp/reportbug-20181013-9167-wpumlrtu
  |       |       `-script /usr/share/bug/firefox/script
  |       |           `-firefox -dump-addons-info /tmp/tmp.6pittQ6yCi
  |       |               `-36*[{firefox}]