diff --git a/webextensions/manifest/dark_theme.json b/webextensions/manifest/dark_theme.json
new file mode 100644
index 00000000000000..fb9c8a703a9f0c
--- /dev/null
+++ b/webextensions/manifest/dark_theme.json
@@ -0,0 +1,825 @@
+{
+  "webextensions": {
+    "manifest": {
+      "dark_theme": {
+        "__compat": {
+          "support": {
+            "chrome": {
+              "version_added": false
+            },
+            "edge": "mirror",
+            "firefox": {
+              "version_added": "68"
+            },
+            "firefox_android": {
+              "version_added": false
+            },
+            "opera": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror"
+          }
+        },
+        "colors": {
+          "__compat": {
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "68"
+              },
+              "firefox_android": {
+                "version_added": false
+              },
+              "opera": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror"
+            }
+          },
+          "bookmark_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "button_background_active": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "button_background_hover": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "frame": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "frame_inactive": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "icons": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "icons_attention": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "ntp_background": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "ntp_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "popup": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "popup_highlight": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "popup_highlight_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "popup_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "tab_background_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "tab_line": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "tab_loading": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "tab_selected": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "tab_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_bottom_separator": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_border": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_border_focus": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_focus": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_highlight": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_highlight_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_field_text_focus": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_text": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_top_separator": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "toolbar_vertical_separator": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          }
+        },
+        "images": {
+          "__compat": {
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "68"
+              },
+              "firefox_android": {
+                "version_added": false
+              },
+              "opera": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror"
+            }
+          },
+          "additional_backgrounds": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "theme_frame": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "68"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          }
+        },
+        "properties": {
+          "__compat": {
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "68"
+              },
+              "firefox_android": {
+                "version_added": false
+              },
+              "opera": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror"
+            }
+          },
+          "color_scheme": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "100"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "content_color_scheme": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "100"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file