In order to install an external extension into Google Chrome browser, I try to update a Chrome external extension JSON file. Using Json.NET it seems to be easy:
Json.NET
You could always convert single-line comments to multi-line comment syntax before parsing...
Something like replace...
.*//.*\n
with
$1/*$2*/
...
Regex.Replace(subjectString, ".*//.*$", "$1/*$2*/");