On Mon, 2 May 2016 18:01, Always Learning wrote: > On Mon, 2016-05-02 at 16:53 +0100, Always Learning wrote: >> firefox-45.1.0-1.1.el5.centos >> >> >> Clicking:- >> Edit >> Preferences >> Privacy >> Show Cookies >> >> no longer works. It always did function before the upgrade to FF 45. > > SOLVED. > > Adblock Plus blocked the 'moz-safe-about:blank' frame. > > Do not understand why 'moz-safe-about:blank' frame needs activating to > see the Cookies. Most of the dialogs have been rewritten from XUL to HTML5. The dialog shown is build by opening a blank html page and then inserting the code (html+css+js) to show the dialog. Thus 'about:blank' (internal called as moz-safe-about:blank) is needed to be allowed in Adblock and Noscript. Does that fill the 'blanks' in the knowledge? - Yamaban.