Yes, that's fair. Indeed my so called improvement requires continual maintenance to add new parameters to the blocklist, which somewhat defeats what is perhaps

Yes, that's fair. Indeed my so called improvement requires continual maintenance to add new parameters to the blocklist, which somewhat defeats what is perhaps the main purpose: convenience. While it is clear that your solution works well for you and would probably work for me too for most types of 'bad' URLs, I am noting down an allowlist based solution for my own satisfaction and future reference: javascript:(()=>{const u=new URL(location.href);[...u.searchParams.keys()].forEach(k=>{if(!['p','q'].includes(k)){u.searchParams.delete(k)}});navigator.clipboard.writeText(u.href)})(); Tested with the following URL: https://duckduckgo.com/?ia=web&origin=funnel_home_website&t=h_&q=hello+world&chip-select=search The bookmarklet copies this cleaned version of the URL: https://duckduckgo.com/?q=hello+world