Feature Request: Default Private Browsing / Private Tab Sessions

[ghost]

Did you search for similar issues before submitting this one?

• Yes, Related: Private browsing by default #5132 How to start Brave in private mode? #8785 Clean private tab on tab close #6684 Allow private tabs to use different sessions (partitions) #597 Make urlbar autocomplete private tab aware #140

Describe the issue you encountered:

• Links opened from other apps and the desktop open in nonprivate session in Brave. This may unintentionally expose data/metadata to third party services on the page attempting to profile the user, particularly when those third party services have not yet been identified by Brave or its components. Browsing data added to the nonprivate session by this type of event is also retained until the nonprivate session data (using this as an all inclusive reference to history, cache, cookies, etc,) is deleted, even with the strictest privacy and security settings, making it difficult to visit a link shared elsewhere without contaminating or exposing existing browsing data by implicit consent.

The following options (and the behaviors described) added to the security tab can prevent this:

• Start Brave in Private Mode - When enabled, Brave will open in Private mode by default. Data from Private tabs is deleted when the browser closes and not shared with the data from a non-private session.
• Private Tab Sessions - Browsing data from a Private tab is not shared with other private tabs.

Additionally, useful context menu integration from the desktop/win explorer:

• Open link in Brave
• Open link in Brave (Private)

Platform and Version information from about:brave

Brave 0.15.2
rev af7ef42
Muon 2.58.9
libchromiumcontent 58.0.3029.96
V8 5.8.283.37
Node.js 7.9.0
Update Channel dev
os.platform win32
os.release 10.0.14393
os.arch x64

• Steps to reproduce:

  1. Open hyperlink from a desktop shortcut, or any other app which does not feature its own web browsing capability

• Expected result:

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  yes

• Is this an issue in the currently released version?
  yes

• Can this issue be consistently reproduced?
  yes

• Extra QA steps:

  1. During testing, check that searches from private tabs/windows aren't contributing to search functionality in fresh windows/tabs and do not persist when Brave is restarted. May require altering really old behavior, so checking for other bugs generated by your fixes is prudent.

• Related information:
  Included context menu suggestion because implementing those first could make most of these features a quick win. Private Tab Sessions may require much more technical involvement.