To unlock the following chapters in Browse mode, complete the following.

"Auld Lang Syne" chapter in Browse mode.
Complete "The Blimp Roof" level in story mode.

"The Revolution Will Be Televised" chapter in Browse mode.
complete the "Bridge Docking Station" level in story mode.

"A Game of Cat and Mouse" chapter in Browse mode
complete the "Subway Platform" level in story mode.