In order to record web scripts, Oxygen extension for Chrome needs to be installed and enabled.
For Windows installation the extension is installed automatically during the installation process. For OS X & Linux the extension needs to be installed manually - https://chrome.google.com/webstore/detail/oxygen/ibbmgejonlmocgjnkmabigdgbolcomea
Open Chrome, go to More Tools > Extensions, and verify that the extension is installed and enabled:
If the extension is not installed, please install it manually using the link provided above.