How to View (the Content of) Safari Cookies
Safari lets you manage cookies, but there is no way to view their content - or is there?
First, to view which cookies Safari keeps, go to Safari's preferences (cmd+;), choose the Privacy pane, and then "Details...". From there, it's easy to remove any (or all) cookie(s) you don't like.
Now, there are three different ways to view the contents of those cookies:
1. Within Safari, enable Developer Mode. For the corresponding menu to appear, you will need to check the respective option in the preferences' "Advanced" pane. Then go to the web site of which you would like to see the cookie(s). From the "Develop" menu, choose "Show Web Inspector" (alt+cmd+i). In the pane that appears at the bottom of the browser window, select "Storage", and then, on the far left, within the directory structure, choose the cookies directory. The Web Inspector will show you all cookies that are connected to the site you're viewing, including all parameters of any cookie.
2. View the Cookies.plist in ~/Library/Safari. This seems to change in Safari 9, not sure if it will still work.
3. Use one of those Safari Cookie apps you can find on the App Store.
The Web Inspector is definitely the easiest way to do it. You can always deactivate the Develop Menu if it gets in the way. (MacConfig)