Description:
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The Online Editor will hang at the Initializing Splash Screen forever when either Google FriendConnect or Facebook Connect is unavailable. Firebug lists the following error:

    google.friendconnect.container is undefined
    https://edit.php.net/js/login-all.js
    Line 1

Reasons for them being unavailable might be network errors or tracker blockers, like Ghostery plugin for FF. Since the editor also provides it's own login mechanism anyway, FB and Google are purely optional and should not terminate script execution when unavailable. The Editor should include a check or try/catch block when registering them in the sidepanel.