I’m new to Firefox and I’ve just made two very basic themes, so I decided to start a collection as I plan on making more. However, I’ve run into trouble with actually creating a collection. I can give the collection a title, enter a description, view the auto-generated URL in the last input box and then click on the blue “Create Collection” button, but all I get is a red error box with a message that reads:
“The custom URL must consist of letters, numbers, underscores or hyphens.”
What on earth am I doing wrong here? Please help. Thank you.