I can write Xpath with or without Firebug/ Firepath but it would be great if there is work around to write Xpath with iframe using these third party tool.
First I need to move to iframe then write regular Xpath for webElements
use xpath to find the iframe. then use getattribute() to get the src. then navigate to the src.
for example:
var myFrame = driver.FindElement("descendant::iframe[@name='TheIFrame']");
string frameSrc = myFrame.GetAttribute("src");
driver.Navigate().GoToUrl(frameSrc);
//now you're on the frame and interact with its DOM
If you don't want to navigate away from the page you're on, you have a few otions:
1) Create a new driver and navigate there
2) use httpclient (less overhead than the driver) to get the content by sending a get to the src url, then use HTMLAgilityPack to load it into an HTMLDoc you can navigate with XPath - of course this will let you scrape data but you won't be able to click buttons or interact with javascript.