I whipped this up in about 2 minutes. If you want an extension where you highlight text and want to search StackOverflow with it, here is the Config.plist
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Version</key> <integer>1</integer> <key>Extension Name</key> <string>StackOverflow Search</string> <key>Extension Identifier</key> <string>net.ericd.stackoverflow</string> <key>Extension Description</key> <string>Open StackOverflow and search for the selected text.</string> <key>Actions</key> <array> <dict> <key>URL</key> <string>http://stackoverflow.com/search?q={popclip text}</string> <key>Image File</key> <string>stacksearch.png</string> <key>Title</key> <string>Google Translate</string> <key>Title</key> <string>StackOverflow</string> </dict> </array> </dict> </plist>
Add a 256×256 .png with your icon to the folder. Rename it with a .popclipext & tada! You have your extension.