I created 4 simple search plugins for Firefox for anyone who is interested.
- wikiubuntutext.src – This searches text at https://wiki.ubuntu.com
- wikiubuntutitle.src – This searches titles at https://wiki.ubuntu.com
- ubuntuhelptext.src – This searches text at https://help.ubuntu.com/community
- ubuntuhelptitle.src – This searches titles at https://help.ubuntu.com/community
Download the archived file to a directory and then extract it. After extraction, copy the files to /usr/share/firefox/searchplugins and enjoy!