1418961 - Web Extension Unable to set cookies using "document.cookie = cName" in Firefox 57

Status: RESOLVED INVALID

(WebExtensions :: Untriaged, defect)

Description

[Acrobat]

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171115114231

Steps to reproduce:

create a simple web extension and in the background script write the below function to create a cookie.

function setCookie (cName) {
        document.cookie = cName ;
    }

This can also be confirmed by debugging extension and giving command document.cookie = "someName" ;





Actual results:

The cookie is not created.


Expected results:

The cookie should be created.

Comment 1

[Acrobat]

This problem has appeared in FF57.

Comment 2

[Andy McKay]

I don't understand what you are trying to do here, are you trying to set a cookie in the background script? What is the point of that?

Comment 3

[Acrobat]

(In reply to Andy McKay [:andym] from comment #2)
> I don't understand what you are trying to do here, are you trying to set a
> cookie in the background script? What is the point of that?

The web-extension sets/creates a cookie for the extension's background.html page. This cookie is used to store user preference/data.

Comment 4

[Acrobat]

(In reply to Andy McKay [:andym] from comment #2)
> I don't understand what you are trying to do here, are you trying to set a
> cookie in the background script? What is the point of that?

I am setting a cookie for extension's background page. starting  FF 57, the cookie is not created using "document.cookie = " .

Comment 5

[Andy McKay]

Whats the advantage of doing that over window.localStorage, browser.storage.local or indexedDB?

Comment 6

[Kris Maglione [:kmag]]

Cookies are only supported in HTTP documents.

Comment 7

[Acrobat]

(In reply to Kris Maglione [:kmag] (long backlog; ping on IRC if you're blocked) from comment #6)
> Cookies are only supported in HTTP documents.

It was working fine till FF 55/56. We ported chrome extension that uses cookies and the web extension was working fine. It is not possible for us to update the extension and user storage APIs , we are affected by this break in FF.

Comment 8

[Kris Maglione [:kmag]]

I'm sorry that this used to work. That was, indeed, a bug.