Finalize release notes for Firefox 156 - #45711

URL: /en-US/docs/Mozilla/Firefox/Releases/156
Title: Firefox 156 release notes for developers (Stable)

• https://whattrainisitnow.com/release/?version=156 (1 time) (Note! This may be a new URL 👀)

URL: /en-US/docs/Mozilla/Firefox/Releases/157
Title: Firefox 157 release notes for developers (Beta)

• https://whattrainisitnow.com/release/?version=157 (1 time) (Note! This may be a new URL 👀)
• https://www.firefox.com/en-US/channel/desktop/ (1 time) (Note! This may be a new URL 👀)

URL: /en-US/docs/Mozilla/Firefox/Releases/158
Title: Firefox 158 release notes for developers (Nightly)

• https://whattrainisitnow.com/release/?version=158 (1 time) (Note! This may be a new URL 👀)
• https://www.firefox.com/en-US/channel/desktop/ (1 time) (Note! This may be a new URL 👀)