add options link in right click menu

background-script.js

@@ -1801,6 +1801,16 @@ async function init_icon()
 
 init_icon();
 
+function open_options(info, tab)
+{
+    try
+    {
+        browser.tabs.create({
+            url:browser.extension.getURL("options.html")
+        });
+    } catch(err) {}
+}
+
 function open_reader(info, tab)
 {
     try
@@ -1846,6 +1856,12 @@ function open_jsonconfig(info, tab)
 
 if(browser.contextMenus)
 {
+    browser.contextMenus.create({
+        id: "nazeka-options",
+        title: "Options",
+        contexts: ["browser_action"],
+        onclick: open_options
+    });
     browser.contextMenus.create({
         id: "nazeka-reader",
         title: "Open Reader",

options.html

@@ -7,6 +7,14 @@
 <title>Nazeka: options</title>
 <script src="include/browser-polyfill.min.js" charset="UTF-8"></script>
 <script type="text/javascript" src="options.js"></script>
+<style>
+body
+{
+    max-width: 900px;
+    margin-left: auto;
+    margin-right: auto;
+}
+</style>
 </head>
 <body>
 <div class=panel>