It's all cool as the others said

and as part of the learning curve you should use the contact tab at the top of the page and request FF to remove the filter if you haven't already
Have a look at the snippet sections in the library, they are there to be used as basis for developing ideas [ you can cut and paste into your own filters ] and will help you understand filter construction better, it is also good etiquette to credit authors whose work is used as part of your filters. If you get stuck on a filter your working on you can post it in User Gallery or Creating Filters and people will happily help you in anyway they can.
Welcome, enjoy and we look forward to your next filter