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bsmth merged 2 commits into from
Aug 31, 2026
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relnote(155): Add details about known issues with UDP traffic #301

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relnote(155): Add details about happy_eyeballs_enabled
bsmth Aug 31, 2026
422e9ae
relnote(155): Add details about happy_eyeballs_enabled
bsmth Aug 31, 2026
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8 changes: 8 additions & 0 deletions release-notes/firefox.md
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Expand Up @@ -31,6 +31,14 @@ Firefox ESR 153 is the current ESR.
- 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))

### Known issues

- Some sites may load slowly or fail to load on networks that block UDP.
This can affect corporate networks where a proxy or firewall blocks QUIC as part of TLS inspection.
To work around it, set `network.http.happy_eyeballs_enabled` to `false` with the [`Preferences`](/reference/policies/preferences/) policy.
A fix is planned for the next dot release.
Does not apply to the ESR. ([bug 2063452](https://bugzil.la/2063452))

## 154

_Released 18 August 2026._
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