Both Chrome and Safari grant this permission persistently. We do too, see https://searchfox.org/mozilla-central/rev/17349477695facefe7d180d7afc2b74a965c21db/browser/modules/PermissionUI.jsm#1122 Our in-memory site permissions (TemporaryPermissions) are usually tied to the lifetime of the tab, not the session. There are exceptions to this, e.g. private browsing where all grants are session-only, controlled via the permission manager. Our UI doesn't explicitly state that the permission is permanent. You can see it by going to permission.site and clicking the "Notification" button.
Bug 1788638 Comment 4 Edit History
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Both Chrome and Safari grant this permission persistently (across sessions). We do too, see https://searchfox.org/mozilla-central/rev/17349477695facefe7d180d7afc2b74a965c21db/browser/modules/PermissionUI.jsm#1122 Our in-memory site permissions (TemporaryPermissions) are usually tied to the lifetime of the tab, not the session. There are exceptions to this, e.g. private browsing where all grants are session-only, controlled via the permission manager. Our UI doesn't explicitly state that the permission is permanent. You can see it by going to permission.site and clicking the "Notification" button.