Try uBlacklist, it's like uBlock, but for search results. https://addons.mozilla.org/en-US/firefox/addon/ublacklist/ https://chromewebstore.google.com/detail/ublacklist/pncfbmia... You can sync the settings and your personal blocklist to either Dropbox or Google Drive. It also has the ability to subscribe to blocklists. Mind, you need to manually turn on search engines and subscribe to lists. The uBlacklist subscript…
Quick tip: turn on the 'Skip the "Block this site" dialog', and disable 'Hide the "Block this site" links' settings -- they make it much quicker to block spam websites (of which there are many on regular search engines).