While looking for @license, the regex found on line 685 in main_background.js doesn't allow the use of block comments (/* ... */).
It reads /\/[\/\*]\s*?(@license)\s+(\S+)\s+(\S+)\s*$/mi which doesn't allow the closing */ at the end of the line, therefore the comment is ignored. It should be something like /\/[\/\*]\s*?(@license)\s+(\S+)\s+(\S+)\s*(\*\/)?$/mi. ( => added (\*\/)? before the $).
