Version 28.1

Changelog Highlights:

• Added support for the Ubuntu Firefox Modifications extension (#229).
• Bug fixes in the Tweak extension.
• Corrected toolbarbuttons look (lighter color for borders and separators between connected buttons). Again.
• Improved styles for inactive windows.

Detailed changelog:
27.1...28.1

Version 27.1

Changelog highlights:

• Small icons for all buttons on the Navigation Toolbar
• Tweak extension and theme in one package
• Fixed scrollbars zooming with page
• Many additional icon changes and bugfixes (see the complete list for details)

Detailed changelog:
25.1...27.1

Version 25.1

Highlights include:

• Support Firefox 25+
• Dropped support for Firefox ≤ 23
• Added lightweight theme support (previously known as "personas" https://addons.mozilla.org/en-US/firefox/themes/)
• Better non-Linux support
• Added support for WOT (Web of Trust)
• Improved Ghostery, DownThemAll
• Enhanced library window (history, bookmarks, etc.)

Full changelog is available at: 24.1...25.1

Version 24.1

• Firefox 24 support
• Developer tools fixes
• Improved cross-platform support (notably: better title bar in Windows)
• Many browser icon adjustments
• Updated extension icon support: Ghostery, Colorzilla
• Added extension icon support: KeeFox
• Drop different style for windows in "inactive" state (:-moz-window-inactive, d76ae5c)
• Improve MS Windows support (#122)

Full list of changes @: 22.2...24.1

Version 22.2

Changes from 22.1 (quickfix):

• Fixed look of toolbar in Library window (#189)

Changes from 20.1:

• Upgraded to Firefox 22
• Use system theme menu colors (from jackinloadup)
• Support for new extensions & reworked several icons (from IsacDaavid)
• New symbolic icon: identity-icons-https-mixed-active.svg
• Fixed undo area on about:newtab
• Changed style of buttons in a notification bar (#182)
• Fixed "All Downloads" link color
• Fixed colors in new download manager UI (#177, #178)

Thanks to all our contributors:
Alexander Seleznev, Reda Lazri, Isaac David Reyes González, Lucas Riutzel, and Garrett LeSage

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Easy installable version @ Launchpad: https://launchpad.net/gnome-integration/firefox-gnome/firefox-gnome-releases/+download/gnome-firefox-22.2.xpi (note: unlike the official Mozilla Add-ons version, this will not auto-update)

Official version (often out-of-date due to Mozilla's lengthy approval process):
https://addons.mozilla.org/en-US/firefox/addon/adwaita/