Environment: Device: Huawei MediaPad M2 (Android 5.1.1); Build: Nightly 58.0a1 (2017-10-15); Steps to reproduce: 1. Open Firefox -> Custom Menu -> Tools ->New Guest Session; 2. On guest mode, go to a website from Top Sites and long tap to open Context Menu; 3. Try to share or bookmark the page. Expected result: The user can't share or bookmark the website. The options are not available. Actual result: The user is able to share or bookmark the website. The options are available only in Context menu.

I don't think this is important to fix before 57's release: - A minuscule percentage of users use guest mode. Here's the absolute number of guest mode users: [1] - afaik, sites that are bookmarked will just be deleted when returning to non-guest mode. - imo, we should just kill guest mode. Android natively supports guests on devices that you'd want to share (tablets) and we can't stop the user from accessing other applications, which are not in guest mode. Private browsing is roughly the same as guest mode (except that we additionally hide features like sharing and bookmarking in guest mode). The ability to share in guest mode is not great - it encourages a guest mode user to use other applications on the device that are not in a guest mode. --- :sorina, please file all Activity Stream related issues in the Activity Stream component, even if they may fit better elsewhere: I'm in charge of all issues that affect AS but I'm only triaging this one component so if they're not filed here, I might not see them. Thanks! [1]: https://sql.telemetry.mozilla.org/queries/4539#table

I spoke with Maria over email: she agrees with my analysis. I filed bug 1409106 for considering removing guest mode.