Does anyone know of any program that allows me to open a html file and it will in turn open that html file in the browsers that I want (Safari / Chrome / FF / IE / Opera) simultaneously?
Have you tried making a BAT or CMD file that runs the browsers and provides the "%1" parameter. then associate that BAT or CMD file with the .html file extension.
For example: file allbrowsers.bat
"C:\Apps\Google\Chrome\Application\chrome.exe" %1 "D:\Apps\Mozilla Firefox\firefox.exe" %1 pause
Then drag and drop an html file onto allbrowsers.bat using Windows explorer.
You can add it to the "Open with" context menu as follows ...
It will open your html file in all browsers but ALSO add "allbrowsers" to the "Open With" menu.
Notepad++ will allow you to open the HTML file for viewing/editing and, from the "Run" menu, allows you to Launch the file in Firefox, IE, Chrome and Safari.