Platform changes (128 → 140)

This document summarizes upstream platform changes in Firefox 128 → 140 that are included in Waterfox 6.6. For authoritative details, always refer to the official Firefox release notes and MDN “Developer Information” pages linked for each version.

Notes:

Some capabilities are experimental or behind preferences. Availability can vary by OS and build.
This list is a high‑level selection; use the linked sources for the complete change sets.

128.0 (baseline)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/128.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/128

129.0 (6 Aug 2024)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/129.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/129

Selected highlights:

HTTPS‑First Mode enabled by default
Reader View: character/word spacing, text alignment, contrast themes
Offline translation via downloadable language packs
Android: Improved page load performance

130.0 (3 Sep 2024)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/130.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/130

Selected highlights:

Partial text translation after full‑page translation
Picture‑in‑Picture auto‑open (experimental)
Linux: Overscroll animations enabled by default
Web Codecs API for desktop platforms

131.0 (1 Oct 2024)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/131.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/131

Selected highlights:

Temporary permissions auto‑remove after 1 hour or tab closure
Swedish language translation support
CHIPS cookie support and enhanced SameSite requirements
Linux: Improved HiDPI support with GTK3 font scaling

132.0 (29 Oct 2024)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/132.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/132

Selected highlights:

Wide Color Gamut WebGL (Windows/macOS)
macOS: Screen/window sharing selection, automatic session resume
Strict tracking protection: all third‑party cookies blocked
Post‑quantum key exchange for TLS 1.3
Removed: HTTP/2 Push

133.0 (26 Nov 2024)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/133.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/133

Selected highlights:

Bounce Tracking Protection in Strict mode
Sidebar access to tabs from other devices
Windows: Canvas2D switched from Direct2D to platform‑independent backends

134.0 (7 Jan 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/134.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/134

Selected highlights:

Linux: Touchpad gestures with kinetic scrolling interruption
Windows: HEVC hardware‑accelerated playback
New Tab layout refresh
Relaxed popup blocking following HTML specifications

135.0 (4 Feb 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/135.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/135

Selected highlights:

Translation support: Simplified Chinese, Japanese, Korean, Russian
Credit card autofill global rollout
Certificate Transparency enforcement and CRLite checking
“Do Not Track” replaced with Global Privacy Control

136.0 (4 Mar 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/136.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/136

Selected highlights:

Sidebar: Quick access to bookmarks, history, synced tabs
Vertical tabs: alternative tab layout option
HTTPS‑First for all page loads with HTTP fallback
SmartBlock: selective social media content unblocking
UK address autofill
macOS: background tab power optimization, HEVC hardware acceleration
Linux: AMD GPU hardware video decoding

137.0 (1 Apr 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/137.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/137

Selected highlights:

Tab Groups: organize with names, colors; save/reopen
Address Bar refresh:
- Unified search buttons
- Search term persistence
- Contextual search modes (@bookmarks, @tabs, @history, @actions)
- Calculator functionality
PDF: Automatic link identification and signing
Linux: HEVC support

138.0 (29 Apr 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/138.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/138

Selected highlights:

Profile Management: separate profiles with custom names, avatars, themes
Windows 11: Acrylic‑style menus
macOS/Linux: Copy links from background tabs

139.0 (27 May 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/139.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/139

Selected highlights:

Full‑page translation for extension pages (moz‑extension://)
Custom New Tab wallpapers with Celestial category
HTTP/3 upload performance improvements
PNG transparency preservation when copying
Temporal API for date/time handling
Chrome migration: CSV export/import required for passwords/payment methods

140.0 (24 Jun 2025)

Firefox Release Notes: https://www.mozilla.org/en-US/firefox/140.0/releasenotes/
MDN Developer Information: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/140

Selected highlights:

Tab unloading capabilities
Vertical tabs enhancements
Extensions button customization
Private browsing security improvements