Microsoft Edge 131.0 (132.0 Bêta & Dev, 133.0 Canary)

Fixed various bugs and performance issues, Dev channel updates, feature updates, policy updates, and site compatibility impacting changes.

Stable channel security updates are listed here.

Dev Channel updates

The following Dev channel updates preceded this Stable channel release. The following Dev notes provide detailed information about the changes in each release.

• Dev Channel update to 131.0.2863.0 is live. - Microsoft Community Hub
• Dev Channel update to 131.0.2875.0 is live. - Microsoft Community Hub
• Dev Channel update to 131.0.2889.0 is live. - Microsoft Community Hub
• Dev Channel update to 131.0.2903.5 is live. - Microsoft Community Hub

Feature updates

• Cancel dialog for beforeunload event. Microsoft Edge changed the behavior of the cancel dialog for the beforeunload event. Calling event.preventDefault in a beforeunload event handler won't prevent the dialog from being shown. Instead, event.returnValue = '' needs to be called in the beforeunload event handler to prevent the cancel dialog. The BeforeunloadEventCancelByPreventDefaultEnabled policy is obsolete and no longer works after Microsoft Edge version 130.
• Changes to Kyber. The Kyber algorithm was standardized with minor technical changes and renamed to the Module Lattice Key Encapsulation Mechanism (ML-KEM). ML-KEM is implemented in the BoringSSL cryptography library, which allows for it to be deployed and utilized by services that depend on this library.The changes to the final version of ML-KEM make it incompatible with the previously deployed version of Kyber. Due to this incompatibility the following changes in Microsoft Edge will be made:
  • Edge switches from supporting Kyber to ML-KEM.
  • Edge offers a key share prediction for hybrid ML-KEM (codepoint 0x11EC).
  • The PostQuantumKeyAgreementEnabled flag and the PostQuantumKeyAgreementEnabled policy applies to Kyber and ML-KEM. Note: The PostQuantumKeyAgreementEnabled policy is scheduled for removal in Edge version 141.
  • Edge will no longer support hybrid Kyber (codepoint 0x6399).
• New sidebar policy. The EdgeSidebarAppUrlHostAllowList policy allows admins to define a list of sites, based on URL patterns, that are not subject to the EdgeSidebarAppUrlHostBlockList. When the policy is configured, the apps listed in the allow list can be opened in sidebar even if they are listed in the block list. For more information, see Manage the sidebar in Microsoft Edge.