I went a bit paranoid recently, and I disabled all cookies in Firefox. I'm manually allowing them for sites that I find worthy.
Then I decided to sync my bookmarks to the Firefox on my phone. (Yeah.) Even though I enabled cookies manually for
about:accounts, Firefox still says that
Cookies and local storage are required.
Cookies are still disabled
The question would be: for what site would I need to grant cookie rights for Firefox sync being able to work?