I want to parse this content using Javascript. The data looks like this:
{\"ss\":[[\"Thu\",\"7:00\",\"Final\",,\"BAL\",\"19\",\"ATL\",\"20\",,,\"56808\",,\"PRE
Generally speaking, you can use JSON.parse to do this. However, that snippet that you have does not appear to be strictly valid JSON (as seen here: http://jsfiddle.net/yK3Gf/ and also by validating the source JSON here: http://jsonlint.com/).
So you will either need to parse it by hand, or get nfl.com to fix up their JSON.
As an alternative, their JSON does parse successfully when using eval(), so you could parse it with something like:
var parsedData = eval('(' + jsonData + ')');
...as shown here: http://jsfiddle.net/yK3Gf/1/
Though be aware that parsing JSON in this way is generally frowned upon (particularly when the data being parsed is being delivered by a third-party source), as it leaves you open to XSS attacks should the data happen to include any executable code inside of it.