diff -durN mozjs-78.11.0.orig/python/mozbuild/mozbuild/action/process_define_files.py mozjs-78.11.0/python/mozbuild/mozbuild/action/process_define_files.py

--- mozjs-78.11.0.orig/python/mozbuild/mozbuild/action/process_define_files.py	2021-05-31 17:20:25.000000000 +0300

+++ mozjs-78.11.0/python/mozbuild/mozbuild/action/process_define_files.py	2023-06-08 13:54:26.396114891 +0300

@@ -36,7 +36,7 @@

             not config.substs.get('JS_STANDALONE'):

         config = PartialConfigEnvironment(mozpath.join(topobjdir, 'js', 'src'))

-    with open(path, 'rU') as input:

+    with open(path, "r") as input:

         r = re.compile('^\s*#\s*(?P<cmd>[a-z]+)(?:\s+(?P<name>\S+)(?:\s+(?P<value>\S+))?)?', re.U)

         for l in input:

             m = r.match(l)

diff -durN mozjs-78.11.0.orig/python/mozbuild/mozbuild/backend/base.py mozjs-78.11.0/python/mozbuild/mozbuild/backend/base.py

--- mozjs-78.11.0.orig/python/mozbuild/mozbuild/backend/base.py	2021-05-31 17:20:25.000000000 +0300

+++ mozjs-78.11.0/python/mozbuild/mozbuild/backend/base.py	2023-06-08 13:54:26.396114891 +0300

@@ -265,7 +265,7 @@

         return status

     @contextmanager

-    def _write_file(self, path=None, fh=None, readmode='rU'):

+    def _write_file(self, path=None, fh=None, readmode="r"):

         """Context manager to write a file.

         This is a glorified wrapper around FileAvoidWrite with integration to

diff -durN mozjs-78.11.0.orig/python/mozbuild/mozbuild/preprocessor.py mozjs-78.11.0/python/mozbuild/mozbuild/preprocessor.py

--- mozjs-78.11.0.orig/python/mozbuild/mozbuild/preprocessor.py	2021-05-31 17:20:25.000000000 +0300

+++ mozjs-78.11.0/python/mozbuild/mozbuild/preprocessor.py	2023-06-08 13:54:26.393115055 +0300

@@ -517,7 +517,7 @@

         if args:

             for f in args:

-                with io.open(f, 'rU', encoding='utf-8') as input:

+                with io.open(f, "r", encoding='utf-8') as input:

                     self.processFile(input=input, output=out)

             if depfile:

                 mk = Makefile()

@@ -807,7 +807,7 @@

                     args = self.applyFilters(args)

                 if not os.path.isabs(args):

                     args = os.path.join(self.curdir, args)

-                args = io.open(args, 'rU', encoding='utf-8')

+                args = io.open(args, "r", encoding='utf-8')

             except Preprocessor.Error:

                 raise

             except Exception:

@@ -862,7 +862,7 @@

     pp = Preprocessor(defines=defines,

                       marker=marker)

     for f in includes:

-        with io.open(f, 'rU', encoding='utf-8') as input:

+        with io.open(f, "r", encoding='utf-8') as input:

             pp.processFile(input=input, output=output)

     return pp.includes

diff -durN mozjs-78.11.0.orig/python/mozbuild/mozbuild/util.py mozjs-78.11.0/python/mozbuild/mozbuild/util.py

--- mozjs-78.11.0.orig/python/mozbuild/mozbuild/util.py	2023-06-08 13:52:03.040966625 +0300

+++ mozjs-78.11.0/python/mozbuild/mozbuild/util.py	2023-06-08 13:57:32.880901093 +0300

@@ -225,7 +225,7 @@

     still occur, as well as diff capture if requested.

     """

-    def __init__(self, filename, capture_diff=False, dry_run=False, readmode="rU"):

+    def __init__(self, filename, capture_diff=False, dry_run=False, readmode="r"):

         BytesIO.__init__(self)

         self.name = filename

         assert type(capture_diff) == bool

@@ -1447,7 +1447,7 @@

         def my_get_command_line():

             with open(

-                os.path.join(os.path.dirname(__file__), "fork_interpose.py"), "rU"

+                os.path.join(os.path.dirname(__file__), "fork_interpose.py"), "r"

             ) as fork_file:

                 fork_code = fork_file.read()

             # Add our relevant globals.