If you do not see IE Tab click on -Get More Extensions-, a new window will open, Scroll down the page and click on IE Tab, follow the instructions.
After Firefox restarts, select -Tools- from the top menu's, then choose -Extensions-, Highlite IE Tab and select -Options-. On the -Sites Filter- tab, type into the -URL:- http://www.aycs.co.uk and click -Add-, then -Apply-.
Close Firefox, re-open, and return to www.aycs.co.uk to see the site work correctly.