I have been using Firefox browser with no problems up until yesterday! I connected an external drive to move some photos across and since then Firefox has not been working properly.

Some sites are ok, but it seems that it will not show any of the graphics, only the wording which is all on the left hand side of the screen.

I have tried resetting it as per Firefox help pages, and have also uninstalled and reinstalled , it has made no difference.

IE is working fine it's just FF

Where do I go from here?

this may help while waiting for the expert. try the following:
1. clear browsing history or
2. uninstall then reinstall your FF.

Nice new site DAL.. Congratulations!