Clear private data on exit

[yoasif]

Why/User Benefit/User Problem

• As a user, I want my browser to always clear certain data chosen by me when close the browser.

Types of data:

-Open Tabs
-Browsing history
-Search history
-Cookies and site data
-Cached images and files
-Site settings

Requirements

• Behind a Feature Flag so QA can spend extra time testing

Acceptance Criteria

• When I close the browser, the data I chose to clear is cleared by Fenix.
• TBD: UX to determine what Recent Tasks behavior looks like

UX Spec
https://mozilla.invisionapp.com/share/4BTIO3EECQU

┆Issue is synchronized with this Jira Task

[joebloggs7657]

Hi please can you tie this feature to the app being closed from the app switcher instead please, Firefox Focus style? I dont think selecting quit from the app menu is common usage nor is this in parity with the desktop firefox implementation . I'm aware that you'll probably need a technical work around but I hope it's still possible by some of your capable devs.
I refer to the feature more so as "Clear private data between sessions" than "on exit".

[yoasif]

Per this comment: #2152 (comment)

Android does not provide a way to tell the difference between a user swiping an app closed and the app being killed in the background.

[joebloggs7657]

Firefox focus manages to do it on Android? Maybe it would be a separate feature request but taking from that implementation would be great imo.

[yoasif]

Focus manages it with a persistent notification AFAIK.

[joebloggs7657]

Oh right that makes sense since Bromite incognito also uses a notification.
Should I make a separate issue to request a similar implementation or something?

[lime124]

removing the ux label - this is on our radar already as it's part of Q3 plans.

[liuche]

QA has said they'd like a little extra time to test this, so this should be ideally behind a feature flag.

[ekager]

This Setting is behind a feature flag for now

[sv-ohorvath]

This is in the RC 2.0-rc2 milestone but can be verified for now only in Nightly.
@ekager Is it correctly included in the 2.0 milestone?

[ekager]

Moved it to the next milestone!

[ekager]

If the user is in PBM we should always blank out the screen in the recent apps tray.

This discussion is out of scope for this ticket and is being discussed here #2768

[sv-ohorvath]

@AmyYLee @vesta0 The homescreen menu doesn't have the Quit option. In my opinion it would make sense to have it there as well, considering it's something you want at hand when you need to quit the browser. What do you think?

[sv-ohorvath]

Otherwise this is verified as fixed on Nightly 9/18. Let me know if you want me to create a new issue for the comment above.

[ekager]

Thanks @sv-ohorvath ! I filed #5442 for the follow up

[sblatz]

@ekager @sv-ohorvath is this ready to move from out behind the feature flag?