The release notes can be found here.

Security:

• High CVE-2020-6542: Use after free in ANGLE.
• High CVE-2020-6543: Use after free in task scheduling.
• High CVE-2020-6544, CVE-2020-6549: Use after free in media.
• High CVE-2020-6545: Use after free in audio.
• High CVE-2020-6547: Incorrect security UI in media.
• High CVE-2020-6548: Heap buffer overflow in Skia.
• High CVE-2020-6550: Use after free in IndexedDB.
• High CVE-2020-6551: Use after free in WebXR.
• High CVE-2020-6552: Use after free in Blink.
• High CVE-2020-6553: Use after free in offline mode.
• Medium CVE-2020-6554: Use after free in extensions.
• Medium CVE-2020-6555: Out of bounds read in WebGL.

• Test a couple websites to make sure that it works as expected.