Attempting to run the desktop version of cesium returns this:
$ cesium
[8479:8479:0110/231252.864970:ERROR:component_loader.cc(165)] Failed to parse extension manifest.
[8559:8559:0110/231334.447447:ERROR:sandbox_linux.cc(371)] InitializeSandbox() called with multiple threads in process gpu-process.
[8559:8559:0110/231335.250164:ERROR:buffer_manager.cc(488)] [.DisplayCompositor]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[INFO] [desktop] Launching Cesium... {"debug":false,"menu":false,"sdk":true,"home":"/home/user"}
[ERROR] [desktop] Error while trying to launch Cesium: Cannot read property 'split' of null TypeError: Cannot read property 'split' of null
at loadSettings (chrome-extension://eddgpcgfbhhopcmllclnjdoiepjnmnjj/cesium-desktop.js:222:96)
at startApp (chrome-extension://eddgpcgfbhhopcmllclnjdoiepjnmnjj/cesium-desktop.js:518:5)
at chrome-extension://eddgpcgfbhhopcmllclnjdoiepjnmnjj/cesium-desktop.js:553:20