Examples of affected extensions include uBlock Origin 1.14.14, Greasemonkey 4.0a, Referer Control 1.27 and Feedbro 3.30.3.
Bug 1406675 - WebExtension cannot use IndexedDB at all if "Accept cookies from websites" is disabled
Bug 1313401 - Background Page LocalStorage is cleared along with site storage
Bug 781982 - IndexedDB does not function in private browsing mode
The cookie issue can be worked around by creating an exception for the extension, as you would for a website. For instance, if you open uBlock Origin's dashboard, the location bar will show something like this:
Code: Select all
moz-extension://9a86b180-1776-1337-bd69-2ec004f0135f/dashboard.html