FF129 release notes (#35354)

* FF129 release notes

* remove leftover 130 in 131

files/en-us/mozilla/firefox/releases/129/index.md

@@ -6,45 +6,25 @@ page-type: firefox-release-notes
 
 {{FirefoxSidebar}}
 
-This article provides information about the changes in Firefox 129 that affect developers. Firefox 129 is the current [Beta version of Firefox](https://www.mozilla.org/en-US/firefox/channel/desktop/#beta) and ships on [August 6, 2024](https://whattrainisitnow.com/release/?version=129).
+This article provides information about the changes in Firefox 129 that affect developers. Firefox 129 was released on [August 6, 2024](https://whattrainisitnow.com/release/?version=129).
 
 ## Changes for web developers
 
-### Developer Tools
-
-### HTML
-
-#### Removals
-
 ### CSS
 
 - The [@starting-style](/en-US/docs/Web/CSS/@starting-style) CSS at-rule is supported. This lets you define starting values for properties set on an element that you want to transition from when the element receives its first style update. Currently animating from `display: none;` is not supported ([Firefox bug 1834876](https://bugzil.la/1834876) and [Firefox bug 1834877](https://bugzil.la/1834877)).
 - The {{CSSXRef("transition-behavior")}} CSS property is supported. This lets you specify if descrete properties, such as {{CSSXRef("display")}} and {{CSSXRef("overlay")}}, can be transitioned by setting the value to [`allow-descrete`](/en-US/docs/Web/CSS/transition-behavior#allow-discrete). ([Firefox bug 1901645](https://bugzil.la/1901645)).
 - `-webkit-font-feature-settings` has been implemented as an alias of the standard {{cssxref("font-feature-settings")}} property ([Firefox bug 1595620](https://bugzil.la/1595620)).
 
-#### Removals
-
 ### JavaScript
 
 - {{jsxref("Float16Array")}} typed arrays are now supported, along with {{jsxref("DataView.prototype.getFloat16()")}} and {{jsxref("DataView.prototype.setFloat16()")}} for reading and setting `Float16Array` values from a {{jsxref("DataView")}}, and the {{jsxref("Math.f16round()")}} static method, which can be used to round numbers to 16 bits. The new type is useful for sharing data with a GPU, in particular for use cases where it makes sense to trade off precision for memory consumption. ([Firefox bug 1903329](https://bugzil.la/1903329).)
 - Regular expressions can now use the same name for [named capturing groups](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Named_capturing_group) in different [disjunction alternatives](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Disjunction). This is allowed because only one alternative in a disjunction will match, so a name declared in several alternatives can only reference one captured group. The names must still be unique within a particular alternative, and across the rest of the pattern. ([Firefox bug 1903288](https://bugzil.la/1903288).)
 
-#### Removals
-
-### SVG
-
-#### Removals
-
 ### HTTP
 
 - HTTPS DNS records can now be resolved using the operating system's DNS resolver on Windows 11, Linux, and Android 10+. This ensures that [DNS over HTTPS (DoH)](https://support.mozilla.org/en-US/kb/dns-over-https-doh-faqs) will be used if a user has enabled it on the device, even if it is not enabled in the browser. This feature allows the use of HTTP/3 without needing to use the {{httpheader("Alt-Svc")}} header and enables automatic upgrade of HTTP requests to HTTPS when the HTTPS DNS record is present. Most importantly, it now allows the use of [Encrypted Client Hello (ECH)](https://support.mozilla.org/en-US/kb/faq-encrypted-client-hello) privacy feature even when DoH is only enabled on the device, not in the browser. ([Firefox bug 1906239](https://bugzil.la/1906239)).
 
-#### Removals
-
-### Security
-
-#### Removals
-
 ### APIs
 
 - The deprecated {{domxref("TextEvent", "textInput")}} event is now supported, enabling web apps that use legacy libraries or frameworks that rely on these events.
@@ -60,22 +40,12 @@ This article provides information about the changes in Firefox 129 that affect d
 - The {{domxref("PerformanceResourceTiming.contentType","contentType")}} and {{domxref("PerformanceResourceTiming.responseStatus","responseStatus")}} properties of the {{domxref("PerformanceResourceTiming")}} interface are now supported, indicating the content type of the fetched resource and the HTTP response status code returned when fetching the resource, respectively. ([Firefox bug 1800443](https://bugzil.la/1800443), [Firefox bug 1796785](https://bugzil.la/1796785).)
 - The {{domxref("RTCDTMFSender.canInsertDTMF")}} property is now supported. It enables you to check whether a WebRTC sender can insert DTMF tones into the outgoing connection. If supported, you can insert DTMF tones by using {{domxref("RTCDTMFSender.insertDTMF()")}}. ([Firefox bug 1623193](https://bugzil.la/1623193)).
 
-#### DOM
-
-#### Media, WebRTC, and Web Audio
-
-#### Removals
-
-### WebAssembly
-
 #### Removals
 
 - The {{domxref('Navigator.vibrate()')}} method has been removed ([Firefox bug 1653318](https://bugzil.la/1653318), [Firefox bug 1900037](https://bugzil.la/1900037)).
 
 ### WebDriver conformance (WebDriver BiDi, Marionette)
 
-#### General
-
 #### WebDriver BiDi
 
 - By default CDP (Chrome DevTools Protocol) is now disabled. It can be re-enabled via the `remote.active-protocols` preference. You can learn more about this on the following [blog post](https://fxdx.dev/deprecating-cdp-support-in-firefox-embracing-the-future-with-webdriver-bidi/). ([Firefox bug 1882089](https://bugzil.la/1882089))
@@ -95,16 +65,6 @@ This article provides information about the changes in Firefox 129 that affect d
 - Fixed an issue with the `network.responseCompleted` event during authentication flows, which was emitted too many times compared to the specifications. Only one `responseCompleted` (or `fetchError`) event is expected for the whole HTTP authentication flow. ([Firefox bug 1906106](https://bugzil.la/1906106))
 - Improved the `browser.removeUserContext` command to skip all "beforeunload" prompts. ([Firefox bug 1876062](https://bugzil.la/1876062))
 
-## Changes for add-on developers
-
-### Removals
-
-### Other
-
-## Experimental web features
-
-These features are newly shipped in Firefox 129 but are disabled by default. To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`. You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.
-
 ## Older versions
 
 {{Firefox_for_developers}}

files/en-us/mozilla/firefox/releases/130/index.md

@@ -6,7 +6,7 @@ page-type: firefox-release-notes
 
 {{FirefoxSidebar}}
 
-This article provides information about the changes in Firefox 130 that affect developers. Firefox 130 is the current [Nightly version of Firefox](https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly) and ships on [September 3, 2024](https://whattrainisitnow.com/release/?version=130).
+This article provides information about the changes in Firefox 130 that affect developers. Firefox 130 is the current [Beta version of Firefox](https://www.mozilla.org/en-US/firefox/channel/desktop/#beta) and ships on [September 3, 2024](https://whattrainisitnow.com/release/?version=130).
 
 ## Changes for web developers
 

files/en-us/mozilla/firefox/releases/131/index.md

@@ -0,0 +1,71 @@
+---
+title: Firefox 131 for developers
+slug: Mozilla/Firefox/Releases/131
+page-type: firefox-release-notes
+---
+
+{{FirefoxSidebar}}
+
+This article provides information about the changes in Firefox 131 that affect developers. Firefox 131 is the current [Nightly version of Firefox](https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly) and ships on [October 1, 2024](https://whattrainisitnow.com/release/?version=131).
+
+## Changes for web developers
+
+### Developer Tools
+
+### HTML
+
+#### Removals
+
+### CSS
+
+#### Removals
+
+### JavaScript
+
+#### Removals
+
+### SVG
+
+#### Removals
+
+### HTTP
+
+#### Removals
+
+### Security
+
+#### Removals
+
+### APIs
+
+#### DOM
+
+#### Media, WebRTC, and Web Audio
+
+#### Removals
+
+### WebAssembly
+
+#### Removals
+
+### WebDriver conformance (WebDriver BiDi, Marionette)
+
+#### General
+
+#### WebDriver BiDi
+
+#### Marionette
+
+## Changes for add-on developers
+
+### Removals
+
+### Other
+
+## Experimental web features
+
+These features are newly shipped in Firefox 131 but are disabled by default. To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`. You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.
+
+## Older versions
+
+{{Firefox_for_developers}}