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Bug 40287: Switch DDG search from POST to GET

Closes #40274.

Bug 33803: Add a secondary nightly MAR signing key

Bug 33803: Move our primary nightly MAR signing key to tor-browser

- Updated layout/svg/tests/test_disabled.html to ensure that this doesn't allow
  rendering SVGs on about:blank and about:srcdoc.

Differential Revision: https://phabricator.services.mozilla.com/D95139

Bug 1658881 - When failing to create a channel and an image request, make sure to set the image blocking status appropriately. r=tnikkel

This is the same status as we do for known no-data protocols here:

  https://searchfox.org/mozilla-central/rev/ac142717cc067d875e83e4b1316f004f6e063a46/dom/base/nsNoDataProtocolContentPolicy.cpp#59

This ensures we treat these two cases the same.

Differential Revision: https://phabricator.services.mozilla.com/D89382

This reverts commit a00c57b6.

The 10.0 series is the last one with CentOS 6 support.

This loads HTTPS Everywhere as a builtin addon from a hardcoded
resource:// URI in desktop. It also ensures that the non-builtin
HTTPS Everywhere addon is always uninstalled on browser startup.

The reason of making this desktop-only is that there are some issues
when installing a builtin extension from geckoview side, making
the extension not available on first startup. So, at least for
now we handle the Fenix case separately. See #40118 for a followup
for investigating these.

In any case, `gCombinedSizes` should be larger than or equal to the
buffer within `MemoryClockCache`.

Differential Revision: https://phabricator.services.mozilla.com/D84274

The `gCombinedSizes` need to be enlarged once the inner buffer within
`MemoryBlockCache` grows. Otherwise, when the `MemoryBlockCache` is
released, subtracting the buffer-size of the `MemoryBlockCache` from
`gCombinedSizes` lead to a underflow.

Differential Revision: https://phabricator.services.mozilla.com/D84273

Firefox Pioneer is an opt-in program in which people volunteer to
participate in studies that collect detailed, sensitive data about
how they use their browser.

In https://bugzilla.mozilla.org/show_bug.cgi?id=1563246 Firefox implemented
fetching the Public Suffix List via RemoteSettings and replacing the default
one at runtime, which we do not want.

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

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

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.

Bug 34196: Update site info URL with the onion name

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.