This bug still occurs with 16.0.2+build1-0ubuntu0.12.10.1 version.

Below you see that xz saves 19% of archive size compared to gzip :
--------------
j@j-VB:~$ 7z l 
/var/cache/apt/archives/thunderbird_16.0.2+build1-0ubuntu0.12.10.1_amd64.deb | 
grep data
Path = data.tar.gz
Path = data.tar.gz
                    .....     49664000     22364697  data.tar
j@j-VB:~$ 7z x 
/var/cache/apt/archives/thunderbird_16.0.2+build1-0ubuntu0.12.10.1_amd64.deb 

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

Processing archive:
/var/cache/apt/archives/thunderbird_16.0.2+build1-0ubuntu0.12.10.1_amd64.deb

Extracting  data.tar

Everything is Ok

Size:       49664000
Compressed: 22368922
j@j-VB:~$ gzip -c --best data.tar > data.tar.gz
j@j-VB:~$ xz -c -9e data.tar > data.tar.xz
j@j-VB:~$ ls -lk data.tar*
-rw-rw-r-- 1 j j 48500 oct.  30 02:33 data.tar
-rw-rw-r-- 1 j j 21826 nov.   1 12:38 data.tar.gz
-rw-rw-r-- 1 j j 17621 nov.   1 12:39 data.tar.xz
j@j-VB:~$
------------

Note that the decompression duration of a xz archive is slightly the
same that a gzip archive.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to thunderbird in Ubuntu.
https://bugs.launchpad.net/bugs/958792

Title:
  thunderbird deb archives should use lzma compression

Status in “thunderbird” package in Ubuntu:
  Opinion

Bug description:
  Anyway, thunderbird requires ~256MB of free memory during operation.

  I think that all thunderbird Debian packages should use lzma
  compression method in order to decrease their size. The parameters of
  the lzma compression should be choosed in order to require a maximum
  of ~256MB of free memory for decompression.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: thunderbird 3.1.19+build1+nobinonly-0ubuntu0.10.04.1
  ProcVersionSignature: Ubuntu 2.6.32-39.86-generic 2.6.32.56+drm33.22
  Uname: Linux 2.6.32-39-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Sun Mar 18 21:24:05 2012
  ProcEnviron:
   LANG=fr_FR.utf8
   SHELL=/bin/bash
  SourcePackage: thunderbird

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