Among other features that Opera has is the right-click Paste and Go option when you paste a link into the address bar. Itloads a site automatically when you paste the URL into the address box. The same applies to search, just paste the search term and the search runs automatically without the need to hit “Enter” or the Search button. Firefox does not have this feature and I missed it dearly.
The add-on is experimental, so you will have to login before you can download the extension.
Download Paste and Go Firefoxaddon