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Cannot load extension in selenium firefox driver (geckodriver)

I manually created a specific firefox profile containing an add-on/extension (Hotspot Shield VPN add on). Now, in code I am loading this profile via the firefox driver, however the problem is that the extension is not being loaded when launched from code. On the other hand it works just fine when launching the profile manually.
var profileManager = new FirefoxProfileManager();
var profile = profileManager.GetProfile("brysontiller");
profile.SetPreference("extensions.allowPrivateBrowsingByDefault", true);
profile.SetPreference("extensions.hotspot-shield#anchorfree.com.onByDefault", true);
var options = new FirefoxOptions { Profile = profile, LogLevel = FirefoxDriverLogLevel.Trace };
var driver = new FirefoxDriver(#"C:\Users\danza\source\repos\InstaManager\", options);
driver.Navigate().GoToUrl("https://www.google.com");
I tried adding the extension in code by using
profile.AddExtension(#"C:\Users\danza\AppData\Roaming\Mozilla\Firefox\Profiles\652o40ny.profile_7\extensions\hotspot-shield#anchorfree.com.xpi");
The above problem still persists with this line of code. (Although this is not really needed as the manually created profile already contains the needed extension so no need to add it again).
I also tried setting various profile preferences as shown below:
profile.SetPreference("extensions.allowPrivateBrowsingByDefault", true);
profile.SetPreference("extensions.hotspot-shield#anchorfree.com.onByDefault", true);
Problem still persists.
Add-on loads when I launch the profile manually as shown below:
But when I launch it via code, it does not:

If you manually created the profile why don't you try to open the browser using it directly:
FirefoxOptions firefoxOptions = new FirefoxOptions();
firefoxOptions.Profile = new FirefoxProfile("Path to the profile");
driver = new FirefoxDriver(..., firefoxOptions);
Could you try and let me know?

Selenium Webdriver c# : Getting "The path is not of a legal form." while initializing FirefoxProfile

I am using below mentioned code to initialize a firefox driver with service, options and timeout.
var Service = FirefoxDriverService.CreateDefaultService(RunConfig.DriverPath);
Service.HideCommandPromptWindow = RunConfig.HideDriverCommandPromptWindow;
var Options = new FirefoxOptions();
if (!string.IsNullOrWhiteSpace(RunConfig.PathToBrowserBinary))
Options.BrowserExecutableLocation = RunConfig.PathToBrowserBinary;
Options.Profile = new FirefoxProfile();
Options.Profile.SetPreference(Preference.Name,PathToDownloadFolder));
Options.Profile.SetPreference(Preference.Name, Preference.Value);
return new FirefoxDriver(Service, Options, TimeSpan.FromSeconds(90));
But it gives me an error that The path is not of legal for while initializing firefox profile

Solved it. The problem was the seleniumwebdriver dll I was using is present in some other project. Adding the selenium webdriver and support dll to the current project worked.

C# Selenium Start Chrome with Different User Profile

For the past 2 days, I've been trying to find a way to start Chrome with a different profile but to no avail.
No matter what I do, the profile that Selenium loads for chrome is always some temporary profile like "C:\Users\DARKBO~1\AppData\Local\Temp\scoped_dir14308_25046\Default"
I have tried the following code:
ChromeOptions options = new ChromeOptions();
options.AddArgument(#"user-data-dir=C:\SeleniumProfiles\Default");
IWebDriver driver = new ChromeDriver();
driver.Navigate().GoToUrl("chrome://version");
First I tried using the directories for the profiles directly from the Chrome folder, didn't work. Then I created a new folder and moved the profiles there, I've tried doing this both in C:\ and in D:\ . No difference whatsoever.
I've tried running the user-data-dir argument both like it currently is in the code and with -- in front of it. I've tried using double backslashes without the # symbol, still nothing. No matter what I do the profile directory is always the Selenium temp directory.
P.S. The current C:\SeleniumProfiles directory I created through the command prompt using the chrome user-data-dir=C:\SeleniumProfiles command
P.S. 2: My mistake was very simple, I forgot to put the options in the constructor of the new driver. And as Tarun made it clear, user-data-dir only gives Chrome the directory that contains the profiles, then we need to use profile-directory argument to give the subdirectory that contains the needed profile.

You din't use the options objects at all.
IWebDriver driver = new ChromeDriver();
Should be
IWebDriver driver = new ChromeDriver(options);
Edit-1 - Chrome profiles and users
Chrome has User data directory for storing profiles. Inside this directory multiple profiles can be maintained. There are two arguments that can be used
user-data-directory
profile-directory
If only user-data-directory is specified then a Default directory inside the same would be used. If profile-directory is specified then that directory inside the user-data-directory is used

If you are starting with the profile of the browser on the computer you are looking for, you can
Open normal google chrome and go to ('chrome://version')
enter link description here
Copy the Profile Path but take all of the "Data" folder and copy it to where the program is running
C# Coding:
https://rextester.com/INK23784
By creating a folder named "profile" where the program is running, you can add all the profile information, plugins, and so on. etc. We have copied the data folder in everything and when opening the browser "ChromeOptions" to selenium your profile files, etc. that's everything

You can try this code: (It worked for me)
string path_profile = #"D:\PROJECT_XMARKETING_4.0\Profiles\1";
// string path_profile = #"D:\PROJECT_XMARKETING_4.0\Profiles2\2";
IWebDriver _webDriver;
ChromeDriverService cService = ChromeDriverService.CreateDefaultService();
cService.HideCommandPromptWindow = true;
_webDriver = new ChromeDriver(cService);
_webDriver.Manage().Cookies.DeleteAllCookies();
ChromeOptions options = new ChromeOptions();
options.AddArgument($"user-data-dir={path_profile}");
_webDriver = new ChromeDriver(cService, options);
//_webDriver.Navigate().GoToUrl("https://phamtani.com/");
//_webDriver.Navigate().GoToUrl("https://alink.vn/");
//_webDriver.Navigate().GoToUrl("http://api.hostip.info/get_json.php");

Set user-data-dir to C:\Users[your-username]\AppData\Local\Google\Chrome\User Data
Full Code:
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Support.UI;
private IWebDriver _driver { set; get; }
public YourConstructor()
{
_driver = CreateBrowserDriver();
}
private IWebDriver CreateBrowserDriver()
{
try
{
var options = new ChromeOptions();
options.AddArgument("test-type");
options.AddArgument("--ignore-certificate-errors");
options.AddArgument("no-sandbox");
options.AddArgument("disable-infobars");
//options.AddArgument("--headless"); //hide browser
options.AddArgument("--start-maximized");
//options.AddArgument("--window-size=1100,300");
//options.AddUserProfilePreference("profile.default_content_setting_values.images", 2);
// Profile [Change:User name]
options.AddArgument(#"user-data-dir=C:\Users\Haddad\AppData\Local\Google\Chrome\User Data");
var service = ChromeDriverService.CreateDefaultService();
service.HideCommandPromptWindow = true;
service.SuppressInitialDiagnosticInformation = true;
return new ChromeDriver(service, options);
}
catch
{
throw new Exception("Error: Chrome is not installed.");
}
}

C# Changing the existing Firefox Profile location in selenium webdriver

I have created a new user profile(In Run, type -> firefox.exe -p and create a new profile). For demo purpose I have created a new folder on my desktop. My new user profile points to this new location (C:\Users\username\Desktop\TemporaryProfile). In my selenium webdriver i want to change the default location of the firefox profile.
FirefoxBinary binary = new FirefoxBinary(#"C:\Program Files (x86)\Mozilla Firefox\firefox.exe");
FirefoxProfile profile = new FirefoxProfile(#"C:\Users\username\Desktop\TemporaryProfile");
FirefoxDriver driver = new FirefoxDriver(binary, profile);
In the preceding code, it is not taking the new firefox profile location rather it is taking the existing one. I mean the default location.
And FireFoxProfile Class has a property named profileDirectory. But unfortunately it is a get property
public string ProfileDirectory { get; }
So I couldn't be able to set the directory location.
How to change the firefox profile location in selenium webdriver? Whenever my script executes it should not take the default profile location rather it should point to the new user profile location. Can anyone tell me how to do this?

This works for me to change profile:
var option = new FirefoxOptions();
var profile = new FirefoxProfile("Path_to_profile");
option.Profile = profile;
IWebDriver driver = new FirefoxDriver(option);

how to use a FirefoxProfile with a IWebDriver

I have lots of problem with Firefox. For most of them, I found lots of solution that use FirefoxDriver object. However I need to use RemoteWebDriver.
All the solutions to my problem use a FirefoxProfile object. is there a way to use this profile for the IWebDriver?
One of the thing I need to do is use the profile to do this:
Firefox webdriver opens first run page all the time
here is how I use my IWebDriver:
driver = new RemoteWebDriver(new Uri("http://localhost:4444/wd/hub"), DesiredCapabilities.Firefox(), TimeSpan.FromSeconds(timeout));

First create the FirefoxProfile and then add it to the capabilities:
// create the profile
var profile = new FirefoxProfile();
// create the capabilities
var capabilities = DesiredCapabilities.Firefox();
capabilities.SetCapability(FirefoxDriver.ProfileCapabilityName, profile.ToBase64String());
// start the remote driver
IWebDriver driver = new RemoteWebDriver(new Uri("http://localhost:4444/wd/hub"), capabilities);