`gBrowser.selectedBrowser.contentPrincipal.origin` is `"https://www.mozilla.org"` in both Nightly and DevEdition. `Services.perms.getAllWithTypePrefix("uitour").map(perm => perm.capability + ": " + perm.principal.origin)` is `Array []` in Nightly, and `Array(5) [ "1: https://www.mozilla.org", "1: https://support.mozilla.org", "1: https://screenshots.firefox.com", "1: about:home", "1: about:newtab" ]` in DevEdition.
Bug 1557153 Comment 28 Edit History
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No container tabs. `gBrowser.selectedBrowser.contentPrincipal.origin` is `"https://www.mozilla.org"` in both Nightly and DevEdition. `Services.perms.getAllWithTypePrefix("uitour").map(perm => perm.capability + ": " + perm.principal.origin)` is `Array []` in Nightly, and `Array(5) [ "1: https://www.mozilla.org", "1: https://support.mozilla.org", "1: https://screenshots.firefox.com", "1: about:home", "1: about:newtab" ]` in DevEdition.