docs(firefox-release): Finalize release note for FF146 release

[dipikabh]

Description

Ran node scripts/content/release-firefox.js 146:

🦊 Firefox Release Notes Updater

📋 Planned updates:
   Firefox 145 → Remove active status
   Firefox 146 → Stable
   Firefox 147 → Beta
   Firefox 148 → Nightly (new page)

📡 Fetching release dates...
   Stable release date: December 8, 2025
   Beta release date: January 12, 2026
   Nightly release date: February 23, 2026

🔄 Updating release notes...

✅ Removed active status from Firefox 145
✅ Updated Firefox 146 to (Stable)
✅ Updated Firefox 147 to (Beta)
✅ Created new Nightly page for Firefox 148

Updated the dates manually for this run (off by a day) to match the release calendar.
(Updated script coming up in #42318)

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Releases/145
• /en-US/docs/Mozilla/Firefox/Releases/146
• /en-US/docs/Mozilla/Firefox/Releases/147
• /en-US/docs/Mozilla/Firefox/Releases/148

External URLs (5)

URL: /en-US/docs/Mozilla/Firefox/Releases/146
Title: Firefox 146 release notes for developers (Stable)

• https://whattrainisitnow.com/release/?version=146 (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/147
Title: Firefox 147 release notes for developers (Beta)

• https://whattrainisitnow.com/release/?version=147 (1 time) (Note! This may be a new URL 👀)
• https://www.firefox.com/en-US/channel/desktop/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/148
Title: Firefox 148 release notes for developers (Nightly)

• https://whattrainisitnow.com/release/?version=148 (1 time) (Note! This may be a new URL 👀)
• https://www.firefox.com/en-US/channel/desktop/ (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2025-12-09 15:45:29)

[bsmth]

Thanks Dipika - is the off-by-one fixed in #42318?

[dipikabh]

Thanks Dipika - is the off-by-one fixed in #42318?

Finally fixed in #42321 (tested locally)

[bsmth]

LGTM, thanks!

[dipikabh]

Thanks for the review!