Source: Wikipedia, the free encyclopedia.
Final release
3.5.5 / November 23, 2009 (2009-11-23)
Operating systemLinux
TypeWeb browser
LicenseMozilla Public License 1.1
WebsiteSwiftweasel Project

Swiftweasel was a

Mozilla Firefox available for the Linux
platform only.


Swiftweasel is optimized using the following methods:


As of the 3.0.3 release, Swiftweasel has shifted its primary optimization from processor specific to profile-guided optimization (PGO).[1] It is a two step building process. The application is compiled one time and then run to produce a profile. The profile is then used to guide a second compilation of the application. Some of the older optimizations are still used, but there are now only Intel and AMD versions of each build. It is released compiled in a tar.gz package. There are also separate installers for Ubuntu and Arch linux available through their communities.

Binary code optimization

Increased Security

  • Better protection from Buffer overflow attacks[6] (Swiftweasel 2.0 uses -D_FORTIFY_SOURCE=2; Firefox 2.0 uses gcc 3.x, which does not support this).[5]


Installed extensions

Swiftweasel has several

extensions installed by default.[7]

  • XForms
  • AdBlock Plus
  • User Agent Switcher[8]
  • Quick Locale Switcher[9]

Swiftweasel-specific changes

Changes made to Swiftweasel include:

  • The default icon set has been replaced with the Kempelton[10] icon set.
  • Swiftweasel uses its own settings directory. The settings, including bookmarks, history, and extensions are imported from
    Mozilla Firefox
    the first time Swiftweasel runs.
  • Plugins stored in /lib/mozilla/plugins and /lib/Firefox/plugins are detected and used by Swiftweasel.


Stable release / July 30, 2009 (2009-07-30)
Operating systemLinux
TypeEmail client
LicenseMozilla Public License 1.1
WebsiteSwiftweasel Project

The Swiftweasel project also builds optimized 32 and 64bit builds of the Thunderbird email client known as Swiftdove.


As of the current version, Swiftdove is also PGO optimized.


The builds of Swiftdove include the 0.9

calendar plugin installed by default.

See also


  1. ^ "PGO".[permanent dead link]
  2. ^ Use the in-browser about:buildconfig URL to check the details of all builds
  3. ^ Use the in-browser about:buildconfig URL to check the details of 2.0 builds
  4. ^ "Optimize Options - Using the GNU Compiler Collection (GCC)".
  5. ^ a b c d e f "About Swiftweasel". Archived from the original on 2012-12-25.
  6. ^ "Limiting buffer overflows with ExecShield". Red Hat. Archived from the original on 2007-02-08.
  7. ^ "Extensions Added". Archived from the original on 2012-12-25.
  8. ^ User Agent Switcher
  9. ^ Quick Locale Switcher Archived 2008-01-17 at the Wayback Machine
  10. ^ Kempelton