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copied!<p>Here is the full code, console application. Summary: preferences file is located in application roaming folder, something like this on windows 7:</p> <p>C:\Users\MYNAME\AppData\Roaming\Mozilla\Firefox\Profiles\d9i9jniz.default\prefs.js</p> <p>We alter this file so that it includes "user_pref("browser.download.useDownloadDir", false);"</p> <p>Restart firefox, and done. Only run this application when firefox is not running.</p> <pre><code> static void Main(string[] args) { if (isFireFoxOpen()) { Console.WriteLine("Firefox is open, close it"); } else { string pathOfPrefsFile = GetPathOfPrefsFile(); updateSettingsFile(pathOfPrefsFile); Console.WriteLine("Done"); } Console.ReadLine(); } private static void updateSettingsFile(string pathOfPrefsFile) { string[] contentsOfFile = File.ReadAllLines(pathOfPrefsFile); // We are looking for "user_pref("browser.download.useDownloadDir", true);" // This needs to be set to: // "user_pref("browser.download.useDownloadDir", false);" List<String> outputLines = new List<string>(); foreach (string line in contentsOfFile) { if (line.StartsWith("user_pref(\"browser.download.useDownloadDir\"")) { Console.WriteLine("Found it already in file, replacing"); } else { outputLines.Add(line); } } // Finally add the value we want to the end outputLines.Add("user_pref(\"browser.download.useDownloadDir\", false);"); // Rename the old file preferences for safety... File.Move(pathOfPrefsFile, Path.GetDirectoryName(pathOfPrefsFile) + @"\" + Path.GetFileName(pathOfPrefsFile) + ".OLD." + Guid.NewGuid().ToString()); // Write the new file. File.WriteAllLines(pathOfPrefsFile, outputLines.ToArray()); } private static string GetPathOfPrefsFile() { // Get roaming folder, and get the profiles.ini string iniFilePath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\Mozilla\Firefox\profiles.ini"; // Profiles.ini tells us what folder the preferences file is in. string contentsOfIni = File.ReadAllText(iniFilePath); int locOfPath = contentsOfIni.IndexOf("Path=Profiles"); int endOfPath = contentsOfIni.IndexOf(".default", locOfPath); int startOfPath = locOfPath + "Path=Profiles".Length + 1; int countofCopy = ((endOfPath + ".default".Length) - startOfPath); string path = contentsOfIni.Substring(startOfPath, countofCopy); string toReturn = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\Mozilla\Firefox\Profiles\" + path + @"\prefs.js"; return toReturn; } public static bool isFireFoxOpen() { foreach (Process proc in Process.GetProcesses()) { if (proc.ProcessName == "firefox") { return true; } } return false; } </code></pre>

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