diff --git a/_ext/edit_on_github.py b/_ext/edit_on_github.py
deleted file mode 100644
index 6c8aca1d..00000000
--- a/_ext/edit_on_github.py
+++ /dev/null
@@ -1,42 +0,0 @@
-"""
-Sphinx extension to add ReadTheDocs-style "Edit on GitHub" links to the
-sidebar.
-
-Loosely based on https://github.com/astropy/astropy/pull/347
-"""
-
-import os
-import warnings
-
-
-__licence__ = 'BSD (3 clause)'
-
-
-def get_github_url(app, view, path):
-    return 'https://github.com/{project}/{view}/{branch}/{path}'.format(
-        project=app.config.edit_on_github_project,
-        view=view,
-        branch=app.config.edit_on_github_branch,
-        path=path)
-
-
-def html_page_context(app, pagename, templatename, context, doctree):
-    if templatename != 'page.html':
-        return
-
-    if not app.config.edit_on_github_project:
-        warnings.warn("edit_on_github_project not specified")
-        return
-
-    path = os.path.relpath(doctree.get('source'), app.builder.srcdir)
-    show_url = get_github_url(app, 'blob', path)
-    edit_url = get_github_url(app, 'edit', path)
-
-    # context['show_on_github_url'] = show_url
-    context['edit_on_github_url'] = edit_url
-
-
-def setup(app):
-    app.add_config_value('edit_on_github_project', '', True)
-    app.add_config_value('edit_on_github_branch', 'master', True)
-    app.connect('html-page-context', html_page_context)
diff --git a/conf.py b/conf.py
index cf229861..3335f0eb 100644
--- a/conf.py
+++ b/conf.py
@@ -41,7 +41,6 @@
     'sphinxcontrib.bibtex',
     'sphinx_rtd_theme',
     'matplotlib.sphinxext.plot_directive',
-    'edit_on_github',
     'purpose',
     'question',
     'geosciapp',
@@ -84,7 +83,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = "en"
+language = None
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
@@ -159,11 +158,6 @@
 # number figures
 numfig = True
 
-# -- Edit on Github Extension ---------------------------------------------
-
-edit_on_github_project = 'geoscixyz/em'
-edit_on_github_branch = 'main'
-
 
 # -- Options for HTML output ----------------------------------------------
 
@@ -172,13 +166,13 @@
 
 import sphinx_rtd_theme
 html_theme = 'sphinx_rtd_theme'
-# html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
-# html_context = {
-#   'display_github': True,
-#   'github_user': 'geoscixyz',
-#   'github_repo': 'em',
-#   'github_version': 'main'
-# }
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+html_context = {
+  'display_github': True,
+  'github_user': 'geoscixyz',
+  'github_repo': 'em',
+  'github_version': 'main'
+}
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
 html_title = 'Electromagnetic Geophysics'