I have a website I'm investigating and want to view HTTP-only cookies in Firefox, Safari, or Chrome.
How can I view these special cookies in OSX?
In Chrome choose View->Developer->Developer tools (or key alt-cmd-I) and the choose the resources tab.
In Safari Develop->Show Page Resources (key alt-cmd-A) choose the storage view. To turn the developer tools on go to Preferences->Advanced and tick the bottom box "Show Develop menu in Menu bar" For more info see the Apple documentation.
The Web Developer plugin for Firefox has a "Cookies -> View Cookie Information" menu choice that displays cookies for a given URL. It differentiates cookies based on http / https for each domain.