diff --git a/tools/docs/index.rst b/tools/docs/index.rst
index 3b4bf984bd1d..ae2a9d593050 100644
--- a/tools/docs/index.rst
+++ b/tools/docs/index.rst
@@ -2,49 +2,18 @@
 Mozilla Source Tree Documentation
 =================================
 
-Source code doc
+.. toctree::
+   :maxdepth: 1
+
+   {indexes}
+
+Python Packages
 ===============
 
 .. toctree::
    :maxdepth: 2
 
-   {source_doc}
-
-
-Build
-=====
-
-.. toctree::
-   :maxdepth: 1
-
-   {build_doc}
-
-
-Testing
-=======
-
-.. toctree::
-   :maxdepth: 1
-
-   {testing_doc}
-
-Python
-======
-
-.. toctree::
-   :maxdepth: 1
-
-   {python_doc}
-
-
-Code quality
-============
-
-.. toctree::
-   :maxdepth: 1
-
-   {code_quality_doc}
-
+   {python_packages}
 
 Managing Documentation
 ======================
@@ -80,9 +49,6 @@ for it:
    documentation for, you can use ``SPHINX_PYTHON_PACKAGE_DIRS`` to
    declare directories containing Python packages. e.g.
    ``SPHINX_PYTHON_PACKAGE_DIRS += ['mozpackage']``.
-5. In ``tools/docs/tree.json``, defines in which category the doc
-   should go.
-
 
 Indices and tables
 ==================
diff --git a/tools/docs/moztreedocs/__init__.py b/tools/docs/moztreedocs/__init__.py
index 19f4c1ff3008..f3e3ef1a089c 100644
--- a/tools/docs/moztreedocs/__init__.py
+++ b/tools/docs/moztreedocs/__init__.py
@@ -4,7 +4,6 @@
 
 from __future__ import absolute_import, unicode_literals
 
-import json
 import os
 
 from mozbuild.base import MozbuildObject
@@ -117,9 +116,6 @@ class _SphinxManager(object):
     def _synchronize_docs(self):
         m = InstallManifest()
 
-        with open(os.path.join(MAIN_DOC_PATH, "tree.json")) as json_data:
-            tree_config = json.load(json_data)
-
         m.add_link(self.conf_py_path, 'conf.py')
 
         for dest, source in sorted(self.trees.items()):
@@ -149,29 +145,14 @@ class _SphinxManager(object):
                     return False
             return True
 
-        def format_paths(paths):
-            source_doc = ['%s/index' % p for p in paths]
-            return '\n   '.join(source_doc)
-
         toplevel_trees = {k: v for k, v in self.trees.items() if is_toplevel(k)}
+        indexes = ['%s/index' % p for p in sorted(toplevel_trees.keys())]
+        indexes = '\n   '.join(indexes)
 
-        CATEGORIES = {}
-        # generate the datastructure to deal with the tree
-        for t in tree_config:
-            CATEGORIES[t] = format_paths(tree_config[t])
-
-        indexes = set(['%s/index' % p for p in toplevel_trees.keys()])
-        # Format categories like indexes
-        cats = '\n'.join(CATEGORIES.values()).split("\n")
-        # Remove heading spaces
-        cats = [x.strip() for x in cats]
-        indexes = tuple(set(indexes) - set(cats))
-        if indexes:
-            # In case a new doc isn't categorized
-            print(indexes)
-            raise Exception("Uncategorized documentation. Please add it in tools/docs/tree.json")
-        print(data)
-        data = data.format(**CATEGORIES)
+        packages = [os.path.basename(p) for p in self.python_package_dirs]
+        packages = ['python/%s' % p for p in packages]
+        packages = '\n   '.join(sorted(packages))
+        data = data.format(indexes=indexes, python_packages=packages)
 
         with open(os.path.join(self.staging_dir, 'index.rst'), 'wb') as fh:
             fh.write(data)
diff --git a/tools/docs/tree.json b/tools/docs/tree.json
deleted file mode 100644
index c68e567de365..000000000000
--- a/tools/docs/tree.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-    "source_doc": [
-        "browser",
-        "dom/dom",
-        "gfx/gfx",
-        "toolkit",
-        "dom/bindings/webidl",
-        "modules/libpref/libpref",
-        "remote",
-        "services/common/services"
-    ],
-    "build_doc": [
-        "python/mach",
-        "tools/try",
-        "build/buildsystem",
-        "taskcluster/taskcluster"
-    ],
-    "testing_doc": [
-        "testing/marionette",
-        "testing/geckodriver"
-    ],
-    "code_quality_doc": [
-        "tools/lint"
-    ],
-    "l10n_doc": [
-        "intl",
-        "tools/compare-locales"
-    ],
-    "python_doc": [
-        "mozbase",
-        "python/python"
-    ]
-}