diff --git a/LICENSE b/LICENSE.txt
similarity index 100%
rename from LICENSE
rename to LICENSE.txt
diff --git a/manifest_firefox/manifest.json b/manifest_firefox/manifest.json
index 75ff87d..f8e21f6 100644
--- a/manifest_firefox/manifest.json
+++ b/manifest_firefox/manifest.json
@@ -37,7 +37,6 @@
 		"default_panel": "sidebar.html",
 		"default_title": "Tree Tabs"
 	},
-	"options_page": "options.html",
 	"applications": {
 		"gecko": {
 			"id": "TreeTabs@jagiello.it",
@@ -46,7 +45,7 @@
 	},
 	"options_ui": {
 		"page": "options.html",
-		"open_in_tab":true
+		"open_in_tab": true
 	},
 	"version": "0.0.16"
 }
\ No newline at end of file
diff --git a/manifest.json b/manifest_opera/manifest.json
similarity index 85%
rename from manifest.json
rename to manifest_opera/manifest.json
index d2c1b47..b5ac018 100644
--- a/manifest.json
+++ b/manifest_opera/manifest.json
@@ -1,5 +1,6 @@
 {
 	"manifest_version": 2,
+	"minimum_opera_version": "42",
 	"default_locale": "en",
 	"background": {
 		"scripts": [ "background.js" ],
@@ -38,14 +39,5 @@
 		"default_title": "Tree Tabs"
 	},
 	"options_page": "options.html",
-	"applications": {
-		"gecko": {
-			"id": "TreeTabs@jagiello.it"
-		}
-	},
-	"options_ui": {
-		"page": "options.html",
-		"open_in_tab":true
-	},
 	"version": "0.0.16"
 }
diff --git a/manifest_vivaldi/manifest.json b/manifest_vivaldi/manifest.json
index f833a5b..fcd0778 100644
--- a/manifest_vivaldi/manifest.json
+++ b/manifest_vivaldi/manifest.json
@@ -15,15 +15,6 @@
 		"16": "icons/16.png"
 	},
 	"permissions": [ "tabs", "sessions", "chrome://favicon/" ],
-
-	"sidebar_action": {
-		"default_icon": {
-			"19": "icons/16.png",
-			"38": "icons/38.png"
-		},
-		"default_panel": "sidebar.html",
-		"default_title": "Tree Tabs"
-	},
 	"commands": {
 		"goto_tab_above": {
 			"suggested_key": {
@@ -38,6 +29,9 @@
 			"description": "Go to tab below"
 		}
 	},
-	"options_page": "options.html",
+	"options_ui": {
+		"page": "options.html",
+		"open_in_tab": false
+	},
 	"version": "0.0.16"
 }