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Extensions 
Chrome
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Center Google Search Results
Move the search results from the left of the screen to the center of the screen.
Rich Results - Structured Data Test Plugin
Extension checks the current URL in browser with Google's Rich Results Test Tool
Highlight or Hide Search Engine Results
Filter search engine results. Block unwanted results and highlight the favorite ones. For Google and other popular search engines.
2-Column Google Results
Adjust the Google results page for wide screens by showing the results in two columns.
Search Results on GrabDuck
Shows GrabDuck search results side by side with Google, DuckDuckGo, Bing, or Yahoo results.
AirBnB cleaning & deposit in search results
See AirBnB cleaning fee, security deposit without opening each listing