This feature had been removed because it was not maintained and buggy.

You can look at this extension or search the Add-ons website.

• Cookie Monster: https://addons.mozilla.org/firefox/addon/cookie-monster/

The "Firefox will: Use custom settings for history" option is still present in Firefox 53. However, there was a change in which options are available for cookie "lifetime". Were you previously using "ask me every time"?

To more closely manage cookies in today's Firefox, here's what I suggest:

(1) On the Options page, Privacy panel, select a default cookie policy among these options:

• Allow sites to set persistent cookies if they want ("Keep until: they expire")
• Allow sites to set only session cookies ("Keep until: I close Firefox") (I use and recommend this)
• Block sites from setting cookies (Uncheck the box for allowing sites to set cookies)

Note: to reveal specific privacy settings, choose "Firefox will: Use custom settings for history

(2) Install an extension that makes it easy to make site-specific changes, such as Cookie Monster.

The Cookie Monster button on the toolbar allows you to see permissions for first party and third party cookies and to change them.

https://addons.mozilla.org/firefox/addon/cookie-monster/

Sample screen shot attached -- the option to "Apply cookie settings to both HTTP and HTTPS" is turned on, which streamlines the menu. With this option you don't have to set/modify permissions for both HTTP or HTTPS on the same site.

Alternately, some users prefer the Self-Destructing Cookies extension, which quietly sweeps away cookies when you close all tabs to a site. I haven't tried that one myself.

https://addons.mozilla.org/firefox/addon/self-destructing-cookies/

As a Vista user the most up to date Firefox version for you will be Fx52.n ESR

• Please see Firefox has ended support for Windows XP and Vista