Google Search Plus 作者： sienori

Add a new item to "more" in google search results.
You can add any search service from the setting page.
In many cases you do not use the text area after [keyword].

URL's example:
Amazon
https://www.amazon.com/gp/search?field-keywords=[keyword]

Twitter
https://twitter.com/search?src=typd&q=[keyword]

YouTube
https://www.youtube.com/results?search_query=[keyword]

Wikipedia
https://en.wikipedia.org/w/index.php?search=[keyword]

Google Play
https://play.google.com/store/search?q=[keyword]

eBay
https://www.ebay.com/sch/i.html?_from=R40&_nkw=[keyword]

Firefox Add-on
https://addons.mozilla.org/ja/firefox/search/?q=[keyword]

Amazon prime video
https://www.amazon.co.jp/s/ref=nb_sb_noss?&url=search-alias%3Dprime-instant-video&field-keywords=[keyword]

Google Scholar
https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=[keyword]

MDN web docs
https://developer.mozilla.org/en/search?q=[keyword]