I've tried to create a Favicon for the ERG website but could never get it to work 
I don't know whether you still want a favicon Adam but to get it to work it has to conform to size and type. I have created favicons for some websites in the past and they have to be 32x32 pixels, created in an "icon edit"program, background made transparent and be placed in the root directory of the website with the following in the <head> part of the webpage <link rel="shortcut icon" href="favicon.ico">.
For the current version of Firefox to display them you need to download an "add-on" as for some reason they were disabled in the latest incarnation.