Once support for SameSite cookies lands (bug 795346), the browser.cookies WebExtension API should be updated to also provide information about the sameSite tag on cookies. This is the documentation for the corresponding feature in Chrome: https://developer.chrome.com/extensions/cookies#type-Cookie https://developer.chrome.com/extensions/cookies#type-SameSiteStatus
Hi Rob, this has been added to the agenda for the August 8 WebExtensions APIs triage meeting. Would you be able to join us? Wiki: https://wiki.mozilla.org/Add-ons/Contribute/Triage#Next_Meeting Agenda: https://docs.google.com/document/d/1I-i1FQ38nwFHNl4hnzTctdsYHXOjJpeAgm1Bm3VoUUA/edit#heading=h.ixspnh6vr384
(In reply to Caitlin Neiman (http://pronoun.is/she) from comment #1) > Hi Rob, this has been added to the agenda for the August 8 WebExtensions > APIs triage meeting. Would you be able to join us? I will attend if I have no other obligations at that time. But there is nothing to implement yet, because the sameSite feature is not yet present in Firefox (see blocking bug 795346). Once that bug is fixed, it is relatively easy to support the attribute in the extension API.