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Use a localized string from Torbutton for the app menu's
"Downloading update" message. This is a temporary fix that can
be removed once Tor Browser is based on Firefox 79 or newer (at
which point the localized string will be included in the Firefox
language packs).

Show update badge and doorhanger when entering the "pending"
state for foreground updates.

Differential Revision: https://phabricator.services.mozilla.com/D79903

Bug 1642404 - add an option to show that an update is being downloaded r=bytesized,fluent-reviewers,flod

Add support for a hidden preference named app.update.notifyDuringDownload
that, when set to true, causes a "Downloading update" message to appear
in the app menu during a MAR download. Clicking the message opens the
about box so the user can see detailed progress information.

Differential Revision: https://phabricator.services.mozilla.com/D77688

Removed #28885 parts of this patch which have been uplifted to Firefox.

Disable the "Create New Login" button when security.nocertdb is true.

Fixes bug 32612.

Bug 33851: Omit Parental Controls.

Bug 30682: Disable Intermediate CA Preloading.

Bug 33855: Ensure that site-specific browser mode is disabled.

Hide elements on about:logins that mention sync, "Firefox LockWise", and
Mozilla's LockWise mobile apps.

Restrict the Enterprise Policies mechanism to only consult a
policies.json file (avoiding the Windows Registry and macOS's
file system attributes).

Add a few disabledByPolicy() checks to the update service to
avoid extraneous (and potentially confusing) log messages when
updates are disabled by policy.

Sample content for distribution/policies.json:
{
  "policies": {
    "DisableAppUpdate": true
  }
}

On Linux, avoid reading policies from /etc/firefox/policies/policies.json

Whenever a valid Onion-Location HTTP header (or corresponding HTML
<meta> http-equiv attribute) is found in a document load, we either
redirect to it (if the user opted-in via preference) or notify the
presence of an onionsite alternative with a badge in the urlbar.

A custom HTTPS Everywhere update channel is installed,
which provides rules for locally redirecting some memorable
.tor.onion URLs to non-memorable .onion URLs.

When these redirects occur, we also rewrite the URL in the urlbar
to display the human-memorable hostname instead of the actual
.onion.

We removed the addon in #32767, but it was still being loaded
from addonStartup.json.lz4 and throwing an error on startup
because its resource: location is not available anymore.

The browser should not need information related to the network
interface or network state, tor should take care of that.

See Bug 1357997 for partial uplift.

Also:
Bug 28051 - Use our Orbot for proxying our connections

Bug 31144 - ESR68 Network Code Review

The GeckoView AndroidManifest.xml is not preprocessed unlike Fennec's
manifest, so we can't use the ifdef preprocessor guards around the
permissions we do not want. Commenting the permissions is the
next-best-thing.

It's time for our rotation again: Move the backup key in the front
position and add a new backup key.

When Tor informs the browser that client authentication is needed,
temporarily load about:blank instead of about:neterror and prompt
for the user's key.

If a correctly formatted key is entered, use Tor's ONION_CLIENT_AUTH_ADD
control port command to add the key (via Torbutton's control port
module) and reload the page.

If the user cancels the prompt, display the standard about:neterror
"Unable to connect" page. This requires a small change to
browser/actors/NetErrorChild.jsm to account for the fact that the
docShell no longer has the failedChannel information. The failedChannel
is used to extract TLS-related error info, which is not applicable
in the case of a canceled .onion authentication prompt.

Add a leaveOpen option to PopupNotifications.show so we can display
error messages within the popup notification doorhanger without
closing the prompt.

Add support for onion services strings to the TorStrings module.

Add support for Tor extended SOCKS errors (Tor proposal 304) to the
socket transport and SOCKS layers. Improved display of all of these
errors will be implemented as part of bug 30025.

Also fixes bug 19757:
 Add a "Remember this key" checkbox to the client auth prompt.

 Add an "Onion Services Authentication" section within the
 about:preferences "Privacy & Security section" to allow
 viewing and removal of v3 onion client auth keys that have
 been stored on disk.

Also fixes bug 19251: use enhanced error pages for onion service errors.

CSS and JS changes to alter the UX surrounding letterboxing. The
browser element containing page content is now anchored to the bottom
of the toolbar, and the remaining letterbox margin is the same color
as the firefox chrome. The letterbox margin and border are tied to
the currently selected theme.

Also adds a 'needsLetterbox' property to tabbrowser.xml to fix a race
condition present when using the 'isEmpty' property. Using 'isEmpty'
as a proxy for 'needsLetterbox' resulted in over-zealous/unnecessary
letterboxing of about:blank tabs.

More concretely, SearchService.jsm 'hijack-blocklists' and
url-classifier-skip-urls.