[tor-bugs] #28896 [Applications/Tor Browser]: Make sure our bundled WebExtensions are running in Private Browsing Mode

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#28896: Make sure our bundled WebExtensions are running in Private Browsing Mode
--------------------------------------------+------------------------------
 Reporter:  gk                              |          Owner:  tbb-team
     Type:  task                            |         Status:
                                            |  needs_information
 Priority:  Medium                          |      Milestone:
Component:  Applications/Tor Browser        |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  ff68-esr TorBrowserTeam201908R  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:                                  |        Sponsor:
                                            |  Sponsor44-can
--------------------------------------------+------------------------------
Changes (by gk):

 * cc: tbb-team (added)
 * status:  needs_review => needs_information


Comment:

 I actually think we are good for our own extensions. System extensions are
 good by default it seems and extensions already running/being shipped with
 are getting whitelisted during migration (see the resulting
 `extensions.webextensions.ExtensionStorageIDB.migrated.https-everywhere-
 eff at eff.org` etc.). Thus I think this is cool for getting extension
 updates as well. That is: updates whitelisted won't break if never
 versions are up for download.

 There is the rest risk of Mozilla messing this up vs. better protection
 against random extensions in Tor's default mode. Right now, I am leaning
 towards following Mozilla's defaults, though, just doing #31555. Thoughts?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28896#comment:5>
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