diff --git a/client/Makefile b/client/Makefile
index 235c8b8..dcc793c 100644
--- a/client/Makefile
+++ b/client/Makefile
@@ -1,5 +1,5 @@
-VERSION := 0.4.2
-SHORTVERSION := 0.4.2
+VERSION := 0.4.3
+SHORTVERSION := 0.4.3
 
 .PHONY: windows package-windows linux package-linux darwin package-darwin clean
 
diff --git a/client/main.go b/client/main.go
index fd42a19..c5e59a9 100644
--- a/client/main.go
+++ b/client/main.go
@@ -34,7 +34,7 @@ import (
 )
 
 const (
-	FIREFLY_VERSION = "0.4.2"
+	FIREFLY_VERSION = "0.4.3"
 )
 
 type clientOptions struct {
@@ -49,6 +49,7 @@ type clientOptions struct {
 	localHTTPAddr  string
 	localUIAddr    string
 	trackingID     string
+	cmdMode        bool
 }
 
 type fireflyClient struct {
@@ -247,6 +248,20 @@ func (c *fireflyClient) stopAutoUpdate() bool {
 	return false
 }
 
+func (c *fireflyClient) setPAC() bool {
+	if c.options.cmdMode {
+		return false
+	}
+
+	if c.appData != nil {
+		v, ok := c.appData.Get("setPAC")
+		if ok && v == "0" {
+			return false
+		}
+	}
+	return true
+}
+
 func (c *fireflyClient) startUpdater() {
 	proxyURL, _ := url.Parse("http://" + c.httpListener.Addr().String())
 	privKey, e := c.loadUpdateKey()
@@ -357,7 +372,9 @@ func (c *fireflyClient) changeLocale(locale string) {
 		c.appData.Put("locale", locale)
 	}
 	c.configureI18n()
-	c.reloadSystray()
+	if !c.options.cmdMode {
+		c.reloadSystray()
+	}
 }
 
 func (c *fireflyClient) exit(err error) {
@@ -401,7 +418,8 @@ func (c *fireflyClient) handleSignals() {
 	}()
 }
 
-func (c *fireflyClient) _main() {
+func (c *fireflyClient) parseOptions() {
+	flag.BoolVar(&c.options.cmdMode, "cmd-mode", false, "command line mode")
 	flag.StringVar(&c.options.localSocksAddr, "local-socks-addr", "127.0.0.1:38250", "SOCKS proxy address")
 	flag.StringVar(&c.options.localHTTPAddr, "local-http-addr", "127.0.0.1:38251", "HTTP proxy address")
 	flag.StringVar(&c.options.localUIAddr, "local-ui-addr", "127.0.0.1:38252", "Web UI address, use random local address when specified address is not available")
@@ -414,7 +432,9 @@ func (c *fireflyClient) _main() {
 	flag.StringVar(&c.options.updateURL, "update-url", "https://update.gofirefly.org/update", "url for auto-update")
 	flag.StringVar(&c.options.trackingID, "tracking-id", "UA-76209591-1", "Google Analytics tracking ID")
 	flag.Parse()
+}
 
+func (c *fireflyClient) _main() {
 	var err error
 	c.fs, err = tarfs.New(Resources, "")
 	if err != nil {
@@ -546,27 +566,32 @@ func (c *fireflyClient) _main() {
 		}
 	}
 	c.ui = startUI(c, uiListener)
+	log.Printf("settings url: %s", c.ui.settingsUrl)
 	// see ui.go
 	go c.uiCommandProc()
 
-	// set PAC
-	icon, err := c.fs.Get("icons/24.ico")
-	if err != nil {
-		log.Fatalf("Unable to load icon for PAC: %s", err)
-	}
-	err = promptPrivilegeEscalation(icon)
-	if err != nil {
-		log.Fatalf("Unable to escalate priviledge for setting PAC: %s", err)
+	if !c.options.cmdMode && c.setPAC() {
+		// set PAC
+		icon, err := c.fs.Get("icons/24.ico")
+		if err != nil {
+			log.Fatalf("Unable to load icon for PAC: %s", err)
+		}
+		err = promptPrivilegeEscalation(icon)
+		if err != nil {
+			log.Fatalf("Unable to escalate priviledge for setting PAC: %s", err)
+		}
+		pacURL := c.ui.handle(pacFilename(), pacHandler(c.httpListener.Addr().String()))
+		enablePAC(pacURL)
+		c.addExitFunc(func() {
+			disablePAC(pacURL)
+		})
 	}
-	pacURL := c.ui.handle(pacFilename(), pacHandler(c.httpListener.Addr().String()))
-	enablePAC(pacURL)
-	c.addExitFunc(func() {
-		disablePAC(pacURL)
-	})
 
 	// systray
-	c.addExitFunc(systray.Quit)
-	c.configureSystray()
+	if !c.options.cmdMode {
+		c.addExitFunc(systray.Quit)
+		c.configureSystray()
+	}
 
 	// clean exit with signals
 	go c.handleSignals()
@@ -574,16 +599,18 @@ func (c *fireflyClient) _main() {
 	// pid file
 	utils.SavePid(c.options.pidFilename)
 
-	// open starting pages
-	if c.openSettingsPage() {
-		c.ui.show()
-	}
-	if c.openLandingPage() {
+	if !c.options.cmdMode {
+		// open starting pages
 		if c.openSettingsPage() {
-			// wait to avoid launching new browser window
-			time.Sleep(3 * time.Second)
+			c.ui.show()
+		}
+		if c.openLandingPage() {
+			if c.openSettingsPage() {
+				// wait to avoid launching new browser window
+				time.Sleep(3 * time.Second)
+			}
+			c.ui.open(c.options.landingPage)
 		}
-		c.ui.open(c.options.landingPage)
 	}
 
 	// updater
@@ -606,5 +633,10 @@ func main() {
 		exitCh:      make(chan error, 1),
 		chExitFuncs: make(chan func(), 10),
 	}
-	systray.Run(client._main)
+	client.parseOptions()
+	if !client.options.cmdMode {
+		systray.Run(client._main)
+	} else {
+		client._main()
+	}
 }
diff --git a/client/resources/locale/en_US.json b/client/resources/locale/en_US.json
index c86a95d..8093fc1 100644
--- a/client/resources/locale/en_US.json
+++ b/client/resources/locale/en_US.json
@@ -12,7 +12,8 @@
     "UI_ADDITIONAL_DOMAINS": "Additional websites(domains) you want to tunnel through proxy",
     "UI_SETTINGS_PAGE": "Open (this) settings page when Firefly starts",
     "UI_LANDING_PAGE": "Open embedded landing page when Firefly starts",
-    "UI_STOP_AUTOUPDATE": "Stop automatically updating to latest version",
+    "UI_SET_PAC": "Try to set browser proxy when FIrefly starts",
+    "UI_STOP_AUTOUPDATE": "Stop automatically updating to the latest version",
     "UI_FEEDBACK": "Issues/Feedback",
     "UI_CLICK_LINK": "Please click this link",
     "UI_LANG": "Language",
diff --git a/client/resources/locale/zh_CN.json b/client/resources/locale/zh_CN.json
index f656fcc..dcaf9c1 100644
--- a/client/resources/locale/zh_CN.json
+++ b/client/resources/locale/zh_CN.json
@@ -12,6 +12,7 @@
     "UI_ADDITIONAL_DOMAINS": "其他通过代理转发的网站(域名)",
     "UI_SETTINGS_PAGE": "Firefly 启动时自动打开配置界面(即本页面)",
     "UI_LANDING_PAGE": "Firefly 启动时自动打开内置首页",
+    "UI_SET_PAC": "Firefly 启动时自动设置浏览器代理",
     "UI_STOP_AUTOUPDATE": "停止自动版本更新",
     "UI_FEEDBACK": "问题/反馈",
     "UI_CLICK_LINK": "请打开这个链接",
diff --git a/client/resources/ui.html b/client/resources/ui.html
index 4b96c17..77fc3bc 100644
--- a/client/resources/ui.html
+++ b/client/resources/ui.html
@@ -57,6 +57,11 @@ <h2>{{ i18n "UI_SETTINGS" }}</h2>
 	{{ i18n "UI_LANDING_PAGE" }}: <a href="{{ .LandingPage }}" target="_blank">{{ .LandingPage }}</a> 
 </label></li>
 
+<li><label>
+    <input type="checkbox" id="setPAC"{{ if .SetPAC }} checked {{ end }}>
+    {{ i18n "UI_SET_PAC" }} 
+</label></li>
+
 <li><label>
     <input type="checkbox" id="stopAutoUpdate"{{ if .StopAutoUpdate }} checked {{ end }}>
 	{{ i18n "UI_STOP_AUTOUPDATE" }} 
diff --git a/client/ui.go b/client/ui.go
index 5bb3772..0b99fc6 100644
--- a/client/ui.go
+++ b/client/ui.go
@@ -118,6 +118,7 @@ type fireflySettings struct {
 	TunnellingAll           bool
 	OpenSettingsPage        bool
 	OpenLandingPage         bool
+	SetPAC                  bool
 	StopAutoUpdate          bool
 	Locales                 map[string]string
 	CurrentLocale           string
@@ -143,6 +144,7 @@ func (u *fireflyUI) settingsGET(w http.ResponseWriter, req *http.Request) {
 		TunnellingAll:           u.client.uiTunnellingAll(),
 		OpenSettingsPage:        u.client.uiOpenSettingsPage(),
 		OpenLandingPage:         u.client.uiOpenLandingPage(),
+		SetPAC:                  u.client.uiSetPAC(),
 		StopAutoUpdate:          u.client.uiStopAutoUpdate(),
 		CustomTunnellingDomains: u.client.uiCustomTunnellingDomains(),
 		Locales:                 locales,
@@ -186,6 +188,12 @@ func (u *fireflyUI) settingsPOST(w http.ResponseWriter, req *http.Request) {
 		} else {
 			u.client.uiCommand(&uiCmd{cmd: "stopAutoUpdateOff"})
 		}
+	case "setPAC":
+		if state == "1" {
+			u.client.uiCommand(&uiCmd{cmd: "setPACOn"})
+		} else {
+			u.client.uiCommand(&uiCmd{cmd: "setPACOff"})
+		}
 	case "updateCustomTunnellingDomains":
 		args := []string{}
 		raw := strings.Split(state, "\n")
@@ -222,6 +230,13 @@ func (c *fireflyClient) uiVersion() string {
 	return v.(string)
 }
 
+func (c *fireflyClient) uiSetPAC() bool {
+	cmd := &uiCmd{cmd: "setPAC?", ret: make(chan interface{})}
+	c.uiCh <- cmd
+	v := <-cmd.ret
+	return v.(bool)
+}
+
 func (c *fireflyClient) uiTunnellingAll() bool {
 	cmd := &uiCmd{cmd: "tunnellingAll?", ret: make(chan interface{})}
 	c.uiCh <- cmd
@@ -298,6 +313,10 @@ func (c *fireflyClient) uiCommandProc() {
 			c.switchFlags("openLandingPage", true)
 		case cmd.cmd == "openLandingPageOff":
 			c.switchFlags("openLandingPage", false)
+		case cmd.cmd == "setPACOn":
+			c.switchFlags("setPAC", true)
+		case cmd.cmd == "setPACOff":
+			c.switchFlags("setPAC", false)
 		case cmd.cmd == "tunnellingAllOn":
 			c.switchTunnelling(true)
 		case cmd.cmd == "tunnellingAllOff":
@@ -325,6 +344,8 @@ func (c *fireflyClient) uiCommandProc() {
 			cmd.ret <- c.openSettingsPage()
 		case cmd.cmd == "openLandingPage?":
 			cmd.ret <- c.openLandingPage()
+		case cmd.cmd == "setPAC?":
+			cmd.ret <- c.setPAC()
 		case cmd.cmd == "stopAutoUpdate?":
 			cmd.ret <- c.stopAutoUpdate()
 		case cmd.cmd == "currentLocale":