I normally use firefox but when i open the developer tools window to investigate a webpage it stops my webpage working and i have to close the browser and run the page again. The page runs fine when the browser is reopened but I cant simply close the tools windows and open another tab and run the page again. Ive never come across this before. It is happening on multiple machines so it isnt the Firefox installation. Its really frustrating as firefox is normally good for debugging.
The same website works fine on Chrome and IE - I can open F12 run a page, then rerun it and not have to close the browser.
Thanks in advance