From dff292441d6e828a435b4ed2c55f36afbe9b51c9 Mon Sep 17 00:00:00 2001 From: Brian Smith Date: Thu, 27 Aug 2026 19:34:18 +0200 Subject: [PATCH 1/2] feat: Add 155 relnotes --- release-notes/firefox.md | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/release-notes/firefox.md b/release-notes/firefox.md index b1c5e04..82f1f0f 100644 --- a/release-notes/firefox.md +++ b/release-notes/firefox.md @@ -3,6 +3,34 @@ # Firefox release notes for enterprise admins +## 155 + +_Upcoming, expected 1 September 2026._ + +These changes apply to Firefox 155 and Firefox ESR 153.2.0 unless explicitly stated. +Firefox ESR 153 is the current ESR. + +### New in Firefox 155 + +- [`DisableLaunchOnLogin`](/reference/policies/disablelaunchonlogin/): This policy prevents Firefox from launching automatically when the user logs in (Windows only in 155). + Does not apply to the ESR. ([bug 2001734](https://bugzil.la/2001734)) + +### Changes + +- [`SitePolicies`](/reference/policies/sitepolicies/): Added an `HttpsOnly` option to prevent specific sites from being loaded over HTTP. + Firefox 155 only. ([bug 2045980](https://bugzil.la/2045980)) +- Captive portal and network connectivity checks now use `firefox-portal-detection.com` instead of `detectportal.firefox.com`. + Network allowlists and proxy rules naming the old domain need updating. + Firefox 155 only. ([bug 2049252](https://bugzil.la/2049252), [bug 1898891](https://bugzil.la/1898891)) + +### Fixes + +- [`ExtensionSettings`](/reference/policies/extensionsettings/): In Firefox 154, configurations that quoted booleans (`"true"`) would break and an invalid entry discarded the whole policy. + The validator is relaxed to accept quoted booleans again, and invalid entries are now individually skipped. ([bug 2065965](https://bugzil.la/2065965)) +- [`SearchEngines`](/reference/policies/searchengines/): Contextual search prompted users to install a search engine when `PreventInstalls` was `true`. Firefox 155 only. ([bug 2055614](https://bugzil.la/2055614)) +- Locking legacy preferences such as `pref.general.disable_button.default_browser` didn't disable the corresponding controls in Firefox Settings, following the Settings rewrite. ([bug 2056928](https://bugzil.la/2056928), [bug 2055887](https://bugzil.la/2055887)) +- Firefox reported that it could pin itself to the taskbar when Windows Group Policy blocked pinning. Firefox 155 only. ([bug 2059920](https://bugzil.la/2059920)) + ## 154 _Released 18 August 2026._ From 39d0ec934b2e9a8a18c0daf2af228c8773b36105 Mon Sep 17 00:00:00 2001 From: Brian Smith Date: Thu, 27 Aug 2026 20:12:35 +0200 Subject: [PATCH 2/2] feat: Changes following reviewer feedback --- release-notes/firefox.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/release-notes/firefox.md b/release-notes/firefox.md index 82f1f0f..23629f3 100644 --- a/release-notes/firefox.md +++ b/release-notes/firefox.md @@ -5,7 +5,7 @@ ## 155 -_Upcoming, expected 1 September 2026._ +_Released 1 September 2026._ These changes apply to Firefox 155 and Firefox ESR 153.2.0 unless explicitly stated. Firefox ESR 153 is the current ESR. @@ -25,7 +25,7 @@ Firefox ESR 153 is the current ESR. ### Fixes -- [`ExtensionSettings`](/reference/policies/extensionsettings/): In Firefox 154, configurations that quoted booleans (`"true"`) would break and an invalid entry discarded the whole policy. +- [`ExtensionSettings`](/reference/policies/extensionsettings/): In Firefox 154 and Firefox ESR 153.1.0, configurations that quoted booleans (`"true"`) would break and an invalid entry discarded the whole policy. The validator is relaxed to accept quoted booleans again, and invalid entries are now individually skipped. ([bug 2065965](https://bugzil.la/2065965)) - [`SearchEngines`](/reference/policies/searchengines/): Contextual search prompted users to install a search engine when `PreventInstalls` was `true`. Firefox 155 only. ([bug 2055614](https://bugzil.la/2055614)) - Locking legacy preferences such as `pref.general.disable_button.default_browser` didn't disable the corresponding controls in Firefox Settings, following the Settings rewrite. ([bug 2056928](https://bugzil.la/2056928), [bug 2055887](https://bugzil.la/2055887))