If you are looking to use DuckDuckGo search but still need to review Google's research for critical search tasks, you can use this Firefox addon.
Make DuckDuckGo your default search engine so that your initial searches start there and this places a convenient button in the URL panel to execute the same search in Google.
this is the entirety of what this extension does, from its code:
// Extract the search query from the DuckDuckGo URL
const url = new URL(tab.url);
const searchQuery = url.searchParams.get('q');
if (searchQuery) {
// Create the Google search URL
const googleUrl = `https://www.google.com/search?q=${encodeURIComponent(searchQuery)}`;
which is identical to what appending !g to a DDG query does