added manifest.json to root for vivaldi as default.

manifest.json

@@ -0,0 +1,37 @@
+{
+	"manifest_version": 2,
+	"default_locale": "en",
+	"background": {
+		"scripts": [ "background.js" ],
+		"persistent": true
+	},
+	"name": "Tree Tabs",
+	"description": "__MSG_extDesc__",
+	"icons": {
+		"128": "icons/128.png",
+		"48": "icons/48.png",
+		"38": "icons/24.png",
+		"19": "icons/16.png",
+		"16": "icons/16.png"
+	},
+	"permissions": [ "tabs", "sessions", "chrome://favicon/" ],
+	"commands": {
+		"goto_tab_above": {
+			"suggested_key": {
+				"default": "Alt+1"
+			},
+			"description": "Go to tab above"
+		},
+		"goto_tab_below": {
+			"suggested_key": {
+				"default": "Alt+2"
+			},
+			"description": "Go to tab below"
+		}
+	},
+	"options_ui": {
+		"page": "options.html",
+		"open_in_tab": false
+	},
+	"version": "0.0.16"
+}