Ok so adding @@||127.0.0.1:41184^$3p to Ublock origin under "My Filters" allows the extension to not be blocked by the "Block Outsider Intrusion into LAN" filter list.
Edit:
@rxliuli I figured out what the remaining issue with Firefox is. Sometimes the url is different when searching and your extension doesn't recognize it when searching on DDG. Google seems to work ok.
e.g. https://duckduckgo.com/?t=ffab=&q=pineapple&ia=web doesn't work but https://duckduckgo.com/?q=pineapple&t=ffab=&ia=web does. I don't know why sometimes when searching in Firefox the url ends up being one or the other.