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diff --git a/comm/mail/installer/removed-files.in b/comm/mail/installer/removed-files.in
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+++ b/comm/mail/installer/removed-files.in
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# The removed-files.in file specifies files and directories to be removed during
+# an application update that are not automatically removed by the application
+# update process. The application update process handles the vast majority of
+# file and directory removals automatically so this file should not be used in
+# the vast majority of cases.
+
+# When to use removed-files.in file to remove files and directories:
+# * Files and directories located in the installation's "distribution/" and
+#   "extensions/" directories that were added before Thunderbird 27. Files and
+#   directories located in these directories were not included in the
+#   application update file removals for a complete update prior to Thunderbird 27.
+# * Empty directories that were accidentally added to the installation
+#   directory.
+# * Third party files and directories that were added to the installation
+#   directory. Under normal circumstances this should only be done after release
+#   drivers have approved the removal of these third party files.
+
+# If you are not sure whether a file or directory should be removed using the
+# removed-files.in file please contact one of the developers that work on
+# application update.
+
+# Note: the "distribution/" and "browser/extensions/" directories should never
+# be removed recursively since these directories are used by Partner builds and
+# custom installations.
+
+# To specify a file to be removed add the path to the file.
+# * If the file doesn't exist the update will succeed.
+# * If the file exists and can't be removed (e.g. the file is locked) the
+#   update will fail.
+#
+# Example: path/to/file
+
+# To specify a directory to be removed only if it is empty add the path to the
+# directory with a trailing forward slash.
+# * If the directory doesn't exist the update will succeed.
+# * If the directory can't be removed (e.g. the directory is locked, contains
+#   files, etc.) the update will succeed.
+#
+# Example: path/to/dir/
+
+# To specify a directory that should be recursively removed add the path to the
+# directory with a trailing forward slash and "*".
+# * If the directory doesn't exist the update will succeed.
+# * If all of the files the directory contains can be removed but the directory
+#   or a subdirectory can't be removed (e.g. the directory is locked) the update
+#   will succeed.
+# * If a file within the directory can't be removed the update will fail.
+#
+# Example: path/to/dir/*
+
+# Due to Apple Mac OS X packaging requirements files that are in the same
+# directory on other platforms must be located in different directories on
+# Mac OS X. The following defines allow specifying the Mac OS X bundle
+# location which will also work on other platforms.
+#
+# @DIR_MACOS@
+# Equals Contents/MacOS/ on Mac OX X and is an empty string on other platforms.
+#
+# @DIR_RESOURCES@
+# Equals Contents/Resources/ on Mac OX X and is an empty string on other
+# platforms.
+
+# An update watershed was required to update to Thunderbird 56 for LZMA and SHA384
+# support. This made it possible to delete all of the removal instructions in
+# this file.
+
+# Since then, the following were added:
+
+# Remove lightning extension.
+#ifdef NIGHTLY_BUILD
+@DIR_RESOURCES@extensions/
+@DIR_RESOURCES@extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/*
+@DIR_RESOURCES@extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}.xpi
+#else
+@DIR_RESOURCES@distribution/
+@DIR_RESOURCES@distribution/extensions/
+@DIR_RESOURCES@distribution/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/*
+@DIR_RESOURCES@distribution/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}.xpi
+#endif
+
+# Remove erroneous files left over from broken Mac signing process
+#ifdef XP_MACOSX
+Contents/Library/Spotlight/thunderbird.mdimporter/Contents/_CodeSignature/._CodeResources
+Contents/Library/Spotlight/thunderbird.mdimporter/Contents/._Info.plist
+Contents/Library/Spotlight/thunderbird.mdimporter/Contents/Resources/._schema.xml
+Contents/Library/Spotlight/thunderbird.mdimporter/Contents/Resources/English.lproj/._InfoPlist.strings
+Contents/Library/Spotlight/thunderbird.mdimporter/Contents/Resources/English.lproj/._schema.strings
+#endif