How can I get URLs of open pages from Chrome and Firefox?

It's specific for every browser. That's for the major ones:

• Internet Explorer - You can use SHDocVw (like you did)
• Firefox - You can get the URL using DDE (source below)
• Chrome - You can get the URL while enumerating all the child windows untill you get to the control with class "Chrome_OmniboxView" and then get the text using GetWindowText
• Opera - You can use the same thing as Firefox, but with "opera"
• Safari - There is no known method since it uses custom drawn controls

EDIT: Since 2014, Chrome has changed and you need to get the URL with Acessibility.

Code to get the URL from Firefox/Opera using DDE (which used NDDE - the only good DDE wrapper for .NET):

//// usage: GetBrowserURL("opera") or GetBrowserURL("firefox")//private string GetBrowserURL(string browser) {    try {        DdeClient dde = new DdeClient(browser, "WWW_GetWindowInfo");        dde.Connect();        string url = dde.Request("URL", int.MaxValue);        string[] text = url.Split(new string[] { "\",\"" }, StringSplitOptions.RemoveEmptyEntries);        dde.Disconnect();        return text[0].Substring(1);    } catch {        return null;    }}

Using UIAutomation - get urls for FireFox and Chrome:

 else if (browser == BrowserType.Chrome)        {            //"Chrome_WidgetWin_1"            Process[] procsChrome = Process.GetProcessesByName("chrome");            foreach (Process chrome in procsChrome)            {                // the chrome process must have a window                if (chrome.MainWindowHandle == IntPtr.Zero)                {                    continue;                }                //AutomationElement elm = AutomationElement.RootElement.FindFirst(TreeScope.Children,                //         new PropertyCondition(AutomationElement.ClassNameProperty, "Chrome_WidgetWin_1"));                // find the automation element                AutomationElement elm = AutomationElement.FromHandle(chrome.MainWindowHandle);                // manually walk through the tree, searching using TreeScope.Descendants is too slow (even if it's more reliable)                AutomationElement elmUrlBar = null;                try                {                    // walking path found using inspect.exe (Windows SDK) for Chrome 29.0.1547.76 m (currently the latest stable)                    var elm1 = elm.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, "Google Chrome"));                    var elm2 = TreeWalker.ControlViewWalker.GetLastChild(elm1); // I don't know a Condition for this for finding :(                    var elm3 = elm2.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, ""));                    var elm4 = elm3.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.ToolBar));                    elmUrlBar = elm4.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, "Address and search bar"));                }                catch                {                    // Chrome has probably changed something, and above walking needs to be modified. :(                    // put an assertion here or something to make sure you don't miss it                    continue;                }                // make sure it's valid                if (elmUrlBar == null)                {                    // it's not..                    continue;                }                // elmUrlBar is now the URL bar element. we have to make sure that it's out of keyboard focus if we want to get a valid URL                if ((bool)elmUrlBar.GetCurrentPropertyValue(AutomationElement.HasKeyboardFocusProperty))                {                    continue;                }                // there might not be a valid pattern to use, so we have to make sure we have one                AutomationPattern[] patterns = elmUrlBar.GetSupportedPatterns();                if (patterns.Length == 1)                {                    string ret = "";                    try                    {                        ret = ((ValuePattern)elmUrlBar.GetCurrentPattern(patterns[0])).Current.Value;                    }                    catch { }                    if (ret != "")                    {                        // must match a domain name (and possibly "https://" in front)                        if (Regex.IsMatch(ret, @"^(https:\/\/)?[a-zA-Z0-9\-\.]+(\.[a-zA-Z]{2,4}).*$"))                        {                            // prepend http:// to the url, because Chrome hides it if it's not SSL                            if (!ret.StartsWith("http"))                            {                                ret = "http://" + ret;                            }                            return ret;                        }                    }                    continue;                }            }        }        else if (browser == BrowserType.Firefox)        {            AutomationElement root = AutomationElement.RootElement.FindFirst(TreeScope.Children,                new PropertyCondition(AutomationElement.ClassNameProperty, "MozillaWindowClass"));                Condition toolBar = new AndCondition(                new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.ToolBar),                new PropertyCondition(AutomationElement.NameProperty, "Browser tabs"));                var tool = root.FindFirst(TreeScope.Children, toolBar);                var tool2 = TreeWalker.ControlViewWalker.GetNextSibling(tool);                var children = tool2.FindAll(TreeScope.Children, Condition.TrueCondition);                foreach (AutomationElement item in children)                {                    foreach (AutomationElement i in item.FindAll(TreeScope.Children, Condition.TrueCondition))                    {                        foreach (AutomationElement ii in i.FindAll(TreeScope.Element, Condition.TrueCondition))                        {                            if (ii.Current.LocalizedControlType == "edit")                            {                                if (!ii.Current.BoundingRectangle.X.ToString().Contains("empty"))                                {                                    ValuePattern activeTab = ii.GetCurrentPattern(ValuePattern.Pattern) as ValuePattern;                                    var activeUrl = activeTab.Current.Value;                                    return activeUrl;                                }                            }                        }                    }                }            }

Maybe this code can help something;Thanks to BLEZ for share this code. I use this code to capture unique addresses from firefox and add them to a listbox. But I think this is not for Chrome right?

(you Should add NDde.dll to your project, to do this go to solution explorer right click to References-> add Reference->Browse-> find that DLL (http://ndde.codeplex.com/ from binary folder.))

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using NDde.Client;namespace WindowsFormsApplication9{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            timer1.Enabled = true;        }        private string GetBrowserURL(string browser)        {            try            {                DdeClient dde = new DdeClient(browser, "WWW_GetWindowInfo");                dde.Connect();                string url = dde.Request("URL", int.MaxValue);                string[] text = url.Split(new string[] { "\",\"" }, StringSplitOptions.RemoveEmptyEntries);                dde.Disconnect();                return text[0].Substring(1);            }            catch            {                return null;            }        }        private void timer1_Tick(object sender, EventArgs e)        {            int j=0;            for (int i = 0; i < listBox1.Items.Count; i++)            {                if (listBox1.Items[i].ToString() == GetBrowserURL("Firefox"))                {                    break;                }                else                {                    j++;                }            }            if (j == listBox1.Items.Count)            {                listBox1.Items.Add(GetBrowserURL("Firefox"));            }        }    }}