meonBot · pull · Jan 13, 2026 · Jan 13, 2026 · Jan 13, 2026 · Jan 13, 2026
diff --git a/files/en-us/glossary/gutters/index.md b/files/en-us/glossary/gutters/index.md
@@ -5,7 +5,7 @@ page-type: glossary-definition
 sidebar: glossarysidebar
 ---
 
-**Gutters** or _alleys_ are spacing between content {{glossary("grid_tracks", "tracks")}}. These can be created in [CSS grid layout](/en-US/docs/Web/CSS/Guides/Grid_layout) using the {{cssxref("column-gap")}}, {{cssxref("row-gap")}}, or {{cssxref("gap")}} properties.
+**Gutters** or _alleys_ are spacing between content {{glossary("grid_tracks", "tracks")}}. These can be created in [CSS grid layout](/en-US/docs/Web/CSS/Guides/Grid_layout), [flex layout](/en-US/docs/Web/CSS/Guides/Flexible_box_layout), and [multi-column layout](/en-US/docs/Web/CSS/Guides/Multicol_layout) using the {{cssxref("column-gap")}}, {{cssxref("row-gap")}}, or {{cssxref("gap")}} properties.
 
 ## Example
 

diff --git a/files/en-us/mozilla/firefox/releases/146/index.md b/files/en-us/mozilla/firefox/releases/146/index.md
@@ -1,8 +1,8 @@
 ---
-title: Firefox 146 release notes for developers (Stable)
-short-title: Firefox 146 (Stable)
+title: Firefox 146 release notes for developers
+short-title: Firefox 146
 slug: Mozilla/Firefox/Releases/146
-page-type: firefox-release-notes-active
+page-type: firefox-release-notes
 sidebar: firefox
 ---
 

diff --git a/files/en-us/mozilla/firefox/releases/147/index.md b/files/en-us/mozilla/firefox/releases/147/index.md
@@ -1,44 +1,36 @@
 ---
-title: Firefox 147 release notes for developers (Beta)
-short-title: Firefox 147 (Beta)
+title: Firefox 147 release notes for developers (Stable)
+short-title: Firefox 147 (Stable)
 slug: Mozilla/Firefox/Releases/147
 page-type: firefox-release-notes-active
 sidebar: firefox
 ---
 
 This article provides information about the changes in Firefox 147 that affect developers.
-Firefox 147 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#beta) and ships on [January 13, 2026](https://whattrainisitnow.com/release/?version=147).
-
-> [!NOTE]
-> The release notes for this Firefox version are still a work in progress.
-
-<!-- Authors: Please uncomment any headings you are writing notes for -->
+Firefox 147 was released on [January 13, 2026](https://whattrainisitnow.com/release/?version=147).
 
 ## Changes for web developers
 
 ### Developer Tools
 
 - When you select a [pseudo-element](/en-US/docs/Web/CSS/Reference/Selectors/Pseudo-elements) (such as {{cssxref("::before")}} or {{cssxref("::after")}}) in the HTML pane of the Inspector, you can now edit the selector of the corresponding rule in the CSS pane.
   ([Firefox bug 1998704](https://bugzil.la/1998704)).
+- During a view transition, {{cssxref("::view-transition")}} pseudo-elements now appear in the elements view. ([Firefox bug 1996608](https://bugzil.la/1996608)).
+- During a view transition, the associated animations now appear in the animations panel. ([Firefox bug 1995296](https://bugzil.la/1995296)).
+- Elements with a valid {{cssxref("anchor-name")}} get an 'anchor' badge in the elements view. ([Firefox bug 1895196](https://bugzil.la/1895196)).
+- A highlighted element's associated {{cssxref("@position-try")}} rules are now displayed in the CSS rules panel. ([Firefox bug 1895176](https://bugzil.la/1895176)).
+- JSON payloads can be imported into Firefox Profiler from the JSON viewer using a new button. This provides a breakdown of the size of the resource. ([Firefox bug 1997209](https://bugzil.la/1997209)).
 
-<!-- ### HTML -->
-
-<!-- No notable changes. -->
-
-<!-- #### Removals -->
-
-<!-- ### MathML -->
+### HTML
 
-<!-- #### Removals -->
+No notable changes.
 
 ### SVG
 
 - When an SVG file is used as an [image source](/en-US/docs/Web/SVG/Guides/SVG_as_an_image) (for example, embedded into a page via an {{htmlelement("img")}} element or as a CSS {{cssxref("background-image")}}), the SVG URL now supports [media fragments](/en-US/docs/Web/URI/Reference/Fragment/Media_fragments). ([Firefox bug 1999989](https://bugzil.la/1999989)). This means that:
   - When the SVG includes a [SMIL animation](/en-US/docs/Web/SVG/Guides/SVG_animation_with_SMIL), you can use [temporal dimension](/en-US/docs/Web/URI/Reference/Fragment/Media_fragments#temporal_dimension_fragment_syntax) syntax to play a portion of the animation from a specific start time to a specific end time, after which the animation will pause.
   - You can use [spatial dimension](/en-US/docs/Web/URI/Reference/Fragment/Media_fragments#spatial_dimension_fragment_syntax) syntax to display a specific area of the SVG document.
 
-<!-- #### Removals -->
-
 ### CSS
 
 - [CSS anchor positioning](/en-US/docs/Web/CSS/Guides/Anchor_positioning) is now enabled by default.
@@ -56,27 +48,13 @@ Firefox 147 is the current [Beta version of Firefox](https://www.firefox.com/en-
 - The following [relative length units based on root element's font](/en-US/docs/Web/CSS/Reference/Values/length#relative_length_units_based_on_root_elements_font) are now supported: `rcap`, `rch`, `rex`, and `ric`. These units allow you to define `<length>` values based on the size of a particular character or font attribute of the [root](/en-US/docs/Web/CSS/Reference/Selectors/:root) element.
   ([Firefox bug 1740584](https://bugzil.la/1740584)).
 
-<!-- #### Removals -->
-
 ### JavaScript
 
 - CSS module scripts are now supported, allowing a stylesheet to be loaded into a script as a {{domxref("CSSStyleSheet")}} instance using the [`import`](/en-US/docs/Web/JavaScript/Reference/Statements/import) keyword and the [`type` import attribute](/en-US/docs/Web/JavaScript/Reference/Statements/import/with) set to `type="css"`.
   ([Firefox bug 1986681](https://bugzil.la/1986681)).
 - The {{jsxref("Iterator.concat()")}} method is now supported. This method enables you to create a new iterator that combines multiple input iterables into a single sequence.
   ([Firefox bug 1986672](https://bugzil.la/1986672)).
 
-<!-- No notable changes. -->
-
-<!-- #### Removals -->
-
-<!-- ### HTTP -->
-
-<!-- #### Removals -->
-
-<!-- ### Security -->
-
-<!-- #### Removals -->
-
 ### APIs
 
 - The {{domxref("Document.activeViewTransition")}} property is now supported, which returns a {{domxref("ViewTransition")}} instance representing the [view transition](/en-US/docs/Web/API/View_Transition_API) currently active on the document. This provides a consistent way to access an active view transition in any context without having to manually store a reference to it for later use. ([Firefox bug 2001836](https://bugzil.la/2001836)).
@@ -90,16 +68,6 @@ Firefox 147 is the current [Beta version of Firefox](https://www.firefox.com/en-
   To load a service worker module, specify a [`type`](/en-US/docs/Web/API/ServiceWorkerContainer/register#type) of `'module'` when calling {{domxref("ServiceWorkerContainer.register()")}}.
   ([Firefox bug 1360870](https://bugzil.la/1360870)).
 
-<!-- #### DOM -->
-
-<!-- #### Media, WebRTC, and Web Audio -->
-
-<!-- #### Removals -->
-
-<!-- ### WebAssembly -->
-
-<!-- #### Removals -->
-
 ### WebDriver conformance (WebDriver BiDi, Marionette)
 
 #### General
@@ -124,10 +92,6 @@ Firefox 147 is the current [Beta version of Firefox](https://www.firefox.com/en-
 
 - Temporarily loaded Manifest Version 3 extensions can now load scripts from localhost, as explained in [Scripts from localhost](/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_Security_Policy#scripts_from_localhost) in the Content Security Policy article. ([Firefox bug 1864284](https://bugzil.la/1864284))
 
-<!-- ### Removals -->
-
-<!-- ### Other -->
-
 ## Experimental web features
 
 These features are shipping in Firefox 147 but are disabled by default.

diff --git a/files/en-us/mozilla/firefox/releases/148/index.md b/files/en-us/mozilla/firefox/releases/148/index.md
@@ -1,13 +1,13 @@
 ---
-title: Firefox 148 release notes for developers (Nightly)
-short-title: Firefox 148 (Nightly)
+title: Firefox 148 release notes for developers (Beta)
+short-title: Firefox 148 (Beta)
 slug: Mozilla/Firefox/Releases/148
 page-type: firefox-release-notes-active
 sidebar: firefox
 ---
 
 This article provides information about the changes in Firefox 148 that affect developers.
-Firefox 148 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [February 24, 2026](https://whattrainisitnow.com/release/?version=148).
+Firefox 148 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#beta) and ships on [February 24, 2026](https://whattrainisitnow.com/release/?version=148).
 
 > [!NOTE]
 > The release notes for this Firefox version are still a work in progress.

diff --git a/files/en-us/mozilla/firefox/releases/149/index.md b/files/en-us/mozilla/firefox/releases/149/index.md
@@ -0,0 +1,83 @@
+---
+title: Firefox 149 release notes for developers (Nightly)
+short-title: Firefox 149 (Nightly)
+slug: Mozilla/Firefox/Releases/149
+page-type: firefox-release-notes-active
+sidebar: firefox
+---
+
+This article provides information about the changes in Firefox 149 that affect developers.
+Firefox 149 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [March 24, 2026](https://whattrainisitnow.com/release/?version=149).
+
+> [!NOTE]
+> The release notes for this Firefox version are still a work in progress.
+
+<!-- Authors: Please uncomment any headings you are writing notes for -->
+
+## Changes for web developers
+
+<!-- ### Developer Tools -->
+
+<!-- ### HTML -->
+
+<!-- No notable changes. -->
+
+<!-- #### Removals -->
+
+<!-- ### MathML -->
+
+<!-- #### Removals -->
+
+<!-- ### SVG -->
+
+<!-- #### Removals -->
+
+<!-- ### CSS -->
+
+<!-- #### Removals -->
+
+<!-- ### JavaScript -->
+
+<!-- No notable changes. -->
+
+<!-- #### 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 shipping in Firefox 149 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.
diff --git a/files/en-us/web/api/fedcm_api/idp_integration/index.md b/files/en-us/web/api/fedcm_api/idp_integration/index.md
@@ -105,7 +105,7 @@ The following table summarizes the different requests made by the FedCM API:
 
 ### The accounts list endpoint
 
-The browser sends credentialed requests (i.e., with a cookie that identifies the user that is signed in) to this endpoint via the `GET` method. The request has no `client_id` parameter, {{httpheader("Origin")}} header, or {{httpheader("Referer")}} header. This effectively prevents the IdP from learning which RP the user is trying to sign in to. The list of accounts returned is RP-agnostic.
+The browser sends requests to this endpoint using the `GET` method. The request has no `client_id` parameter, {{httpheader("Origin")}} header, or {{httpheader("Referer")}} header. This effectively prevents the IdP from learning which RP the user is trying to sign in to.
 
 For example:
 
@@ -117,7 +117,11 @@ Cookie: 0x23223
 Sec-Fetch-Dest: webidentity
 ```
 
-The response to a successful request returns a list of all the IdP accounts that the user is currently signed in with (not specific to any particular RP), with a JSON structure that matches the following:
+The request is credentialed: that is, it includes cookies for the IdP's site, which the IdP can use to identify which IdP accounts the user is signed into.
+
+Note that because the browser's request to this endpoint is a cross-site request, cookies will only be included if they have a [`SameSite`](/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie#samesitesamesite-value) attribute value of `None`. This means that IdP's can't use `SameSite` as part of their defense against [Cross-Site Request Forgery(CSRF)](/en-US/docs/Web/Security/Attacks/CSRF) attacks, so they must implement alternative defenses.
+
+The response returns a list of all the IdP accounts that the user is currently signed in with (not specific to any particular RP), with a JSON structure that matches the following:
 
 ```json
 {

diff --git a/files/en-us/web/api/webgpu_api/index.md b/files/en-us/web/api/webgpu_api/index.md
@@ -59,7 +59,12 @@ async function init() {
     throw Error("WebGPU not supported.");
   }
 
-  const adapter = await navigator.gpu.requestAdapter();
+  let adapter;
+  try {
+    adapter = await navigator.gpu.requestAdapter();
+  } catch (error) {
+    console.error(error);
+  }
   if (!adapter) {
     throw Error("Couldn't request WebGPU adapter.");
   }