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Bug 41066: Compress the APKs more

Merge Info

Related Issues



  • Immediate: patchset needed as soon as possible
  • Next Minor Stable Release: patchset that needs to be verified in nightly before backport
  • Eventually: patchset that needs to be verified in alpha before backport
  • No Backport (preferred): patchset for the next major stable

(Optional) Justification

  • Emergency security update: patchset fixes CVEs, 0-days, etc
  • Censorship event: patchset enables censorship circumvention
  • Critical bug-fix: patchset fixes a bug in core-functionality
  • Consistency: patchset which would make development easier if it were in both the alpha and release branches; developer tools, build system changes, etc
  • Sponsor required: patchset required for sponsor
  • Other: unblock the release

Issue Tracking


Request Reviewer

  • Request review from an applications developer depending on modified system:
    • NOTE: if the MR modifies multiple areas, please /cc all the relevant reviewers (since gitlab only allows 1 reviewer)
    • accessibility : henry
    • android : clairehurst, dan
    • build system : boklm
    • extensions : ma1
    • firefox internals (XUL/JS/XPCOM) : ma1
    • fonts : pierov
    • frontend (implementation) : henry
    • frontend (review) : donuts, richard
    • localization : henry, pierov
    • macos : clairehurst, dan
    • nightly builds : boklm
    • rebases/release-prep : boklm, dan, ma1, pierov, richard
    • security : ma1
    • signing : boklm, richard
    • updater : pierov
    • misc/other : pierov, richard

Change Description

We need to shave a few MBs from our x86 APK, so I tried to re-compress it with 7-zip.

The p7zip package included in bullseye gave me a few problems (but maybe I was using a wrong command line, after all?).

There's also a 7zip package. It seems p7zip changes were taken upstream, and in Trixie p7zip has recently become a transitional package.

Sadly, bullseye doesn't include a 7zip package. It does in backports, but I don't think we can use them, except for manually downloading the file and installing it as a prestep?

So, I moved the browser container to bookworm already, since apksigner works also on Java 17.

How Tested

Built with

rbm/rbm build browser --target torbrowser-android-x86 --target release


  1. noticed we have a reduced size: 115011751 -> 110845359
  2. checked we're reproducible (I tested on my machine and in tb-build-02, but I used the same firefox-android artifact to avoid having to build everything - but I'll take for granted the contents were already reproducible)
Edited by Pier Angelo Vendrame

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