If you’re seeing sponsored results in Google and you’re running uBlock Origin in Firefox then there’s something wrong. You might have an adware extension installed or some other issue on your machine, you might have disabled the filters that block those results in uBlock or might have a conflicting extension, or you might just need to update your filter lists.

Of course that doesn’t help the actually quality of results. You can use Let’s Block It! - Search Engine Results to build a filter that can be added to uBlock Origin. This lets you customize the list for your search engine(s) of choice, and it has checkboxes to automatically block a lot of sites that just mirror content.

However, uBlacklist might be a better option, and Awesome uBlacklist includes a link to a list dedicated to blocking content farm links (https://raw.githubusercontent.com/wdmpa/content-farm-list/main/uBlacklist.txt is the list itself that you would add as a uBlacklist subscription).