Here goes. If you have a problem with firefox crashing after you click the green button to run the project i have found the solution.
OPEN FIREFOX FIRST AND ADD ABOUT TWO TABS TO IT, EG: have 2 homepages loaded in firefox. CLICK THE RUN BUTTON AGAIN ON YOUR PROJECT AND IT WILL WORK FINE.
This also fixes the mouse and keyboard movement bug as chrome does f!@k it up.
Hope this helps people