So here is how you can easily view the source. Install "Execute JS" plug in. Then load the page you would like to view source. Then you click on "Tools -> Open Execute JS". Then check the "Content Window" and choose the title of the window that you would like to view the source for. Now in the "JS-Code to execute", just type the following:
document.documentElement.innerHTMLThen click on "Execute". You will find the HTML Source of the page displayed in the bottom pane. Execute JS is pretty powerful that you can type any arbitrary expression and execute.
Hope that helps.