added :buffers [filter]

content/completion.js

@@ -787,7 +787,7 @@ function Completion() //{{{
             // FIXME: liberator.has("tabs")
             let items = [];
             let xml = <table/>
-            filter = filter || "";
+            filter = (filter || "").toLowerCase();
 
             for (let [i, browser] in tabs.browsers)
             {

content/tabs.js

@@ -478,8 +478,8 @@ function Tabs() //{{{
 
         commands.add(["buffers", "files", "ls", "tabs"],
             "Show a list of all buffers",
-            function (args) { tabs.list(); },
-            { argCount: "0" });
+            function (args) { tabs.list(args.string); },
+            { argCount: "*" });
 
         commands.add(["quita[ll]", "qa[ll]"],
             "Quit " + config.name,