how to run a browser through code

For launching a default browser you need to just call ShellExecute as shown below

ShellExecute(NULL, "open", "http://www.microsoft.com", NULL, NULL, SW_SHOWNORMAL);

Check this Tip/Trick
Opening the Internet Browser Programmatically[^]

You have to supply the fully qualified path the FireFox.exe. Firefox is not going to be found in the PATH environment variable, so you're going to have to tell the machine where to find it.

So you want to call a specified browser with arguments..
For that you can query registry location: HKLM\Software\Clients\StartMenuInternet"
and get the list of installed browser in the machine.
Then for the specified browser you have to query HKLM\Software\Clients\StartMenuInternet\<Browser>\shell\open\command"
This will provide installed path of the specified browser.
Now by using this installed path you can call shellExecute as shown below.

ShellExecute(NULL, L"open", <BrowserInstalledPath>, <ParametersToBrowser>, NULL, SW_SHOWNORMAL);

Suppose we need to call Google Chrome which will open www.yahoo.com, then shellexecute will be

ShellExecute(NULL, L"open", L"C:\\Users\\chandrakant\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", L"www.yahoomail.com", NULL, SW_SHOWNORMAL);

<pre lang="vb"> System.Diagonstics.Process.Start("firefox.exe" "google.com")</pre>