This release focuses on Firefox compatibility and browser-extension platform stability.

Highlights

• Improved Firefox compatibility across the extension runtime, including side panel access, offscreen document handling, and shadow DOM detection used by autofill.
• Raised the Firefox minimum supported version to 142.0 to align with the APIs this build now depends on.
• Hardened autofill overlay rendering by removing direct innerHTML = "" clears in favor of safer DOM replacement calls.
• Added a browser-safe polyfill for explicit resource management globals such as Symbol.dispose, Symbol.asyncDispose, and SuppressedError.
• Updated webpack output settings to use globalThis, improving runtime behavior in extension contexts.

Firefox / AMO Packaging

• Bumped the browser extension version to 2026.5.3.
• Reworked the Firefox AMO packaging script to automatically keep package.json, manifest.json, manifest.v3.json, and package-lock.json version data in sync.
• Cleaned up previous Firefox build artifacts before packaging to reduce stale output issues.
• Reorganized the AMO source package so the built extension archive is available at the package root and the full rebuildable source tree is included under source/.
• Added clearer AMO source-package build and upload instructions for reviewer verification.

Autofill and Extension Runtime

• Centralized browser API access behind helper utilities so unsupported extension APIs fail gracefully instead of relying on direct property access.
• Improved side panel open and close flows used by keyboard commands and popup-driven autofill actions.
• Improved compatibility with browsers that expose closed shadow-root helpers differently, which helps autofill field discovery on more pages.