GoogleEnhancer is a one of the best free addon which lets you refine google search results by adding favicons, keyword highlighting, consecutive numbering as well as by addition of ‘search by date’, ‘search by language’ and ‘search by file-type’ options.
Each features of this addon which affect the search results can be enabled and disabled form the addon options, here is how you can configure these options.
1. Go to File Menu >> Tools >> Add-ons
2. click options as highlighted in the image below
3. Now select all those features you want to have enabled.
4. That’s it done, Enjoy the enhanced google search.