Goanna (software)

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Goanna logo
Developer(s)M. C. Straver[1]
Initial releaseJanuary 2016[2]
Written inC++
TypeBrowser engine
LicenseMPL 2.0

Goanna is an open-source browser engine that is a fork of Mozilla's Gecko.[3] It is used in the Pale Moon browser, the Basilisk browser, and other UXP-based applications.[4][5]

Goanna as an independent fork of Gecko was first released in January 2016.[2] The project's founder and lead developer, M. C. Straver,[1] had both technical and legal motives to do this in the context of Pale Moon's increasing divergence from Firefox.[6][7]

There are two significant aspects of Goanna's divergence: It does not have any of the Rust language components that were added to Gecko during Mozilla's Quantum project,[8][9] and applications that use Goanna always run in single-process mode, whereas Firefox became a multi-process application.[10][11]

Standards support[edit]

Core web standards supported in Goanna:

  • HTML versions 3 and 4, and most of the living HTML5 standard.
  • CSS versions 2 and 3
  • DOM Level 2 and 3


  1. ^ a b M.C. Straver. "About Moonchild Productions". Archived from the original on 2017-03-13. Retrieved 2018-04-19.
  2. ^ a b Release notes for old versions of Pale Moon
  3. ^ M.C. Straver. "The Goanna layout engine". Archived from the original on 2017-04-25. Retrieved 2018-04-19.
  4. ^ "UXP vs goanna".
  5. ^ "There is only XUL". Retrieved 18 September 2018.
  6. ^ "Introducing Goanna". M.C. Straver. 2015-06-22. Retrieved 2017-02-10.
  7. ^ "Pale Moon to switch from Gecko to Goanna rendering engine". ghacks.net. 2015-06-22. Retrieved 2017-11-25.
  8. ^ Basilisk web browser
  9. ^ "Quantum". Mozilla Wiki. Retrieved 2018-04-18.
  10. ^ "Multiprocess Firefox". Mozilla. Retrieved 24 August 2018.
  11. ^ "Multi-process, or: the drawbacks nobody ever talks about". Pale Moon forum. M.C. Straver. Retrieved 24 August 2018.