I'm pinning a lot of websites that require cookies in some way. Without cookies, the thumbnails mostly show login screens and cookie walls. Is there a way to tell Firefox that it can use cookies for the top/pinned sites thumbnails?

I don't mind hacks or fiddling with about:config.


  • Most websites that use cookies for authentication expire the cookies after a set time for security reasons. The format and content of cookies is not standard. – Burgi Oct 26 '15 at 13:30
  • Due to the consistency of the issue, this is unlikely to be related to expiration. It is probably a security or privacy measure by Firefox that may or may not be configurable somehow. – Blaise Oct 26 '15 at 14:51
  • That is a fair point. I wonder if they are just pre-rendered snapshots or if the browser makes a request each time. – Burgi Oct 26 '15 at 21:33
  • According to this KB article they are snapshotted the first time you go to the website. You would have to probably write a plugin to get the behaviour you want – Burgi Oct 26 '15 at 21:44

I have been browsing the source.

This is the place where the browser that will capture the thumbnails is configured:

priority = Ci.nsISupportsPriority.PRIORITY_LOWEST;

docShell.allowMedia = false;
docShell.allowPlugins = false;
docShell.allowContentRetargeting = false;
let defaultFlags = Ci.nsIRequest.LOAD_ANONYMOUS |
                   Ci.nsIRequest.LOAD_BYPASS_CACHE |
                   Ci.nsIRequest.INHIBIT_CACHING |

There's no plugin hook or infrastructure to extend these defaultFlags.

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