You can add your own website’s where you want to search.
Simply add your title and url, replace the searched word with #query#
#query# is being replaced with your selected text.
Extra option(s) in your context-menu.
1.0 Extension created
1.1 Name change to YourSE
1.2 Added support for Chinese characters (thanks kim for helping me debug)
Todo / Requests
See if they can be placed in a submenu (oleg)