ViewTube and Linterna Magica are Greasemonkey scripts. Linterna Magica can be downloaded from here: http://linterna-magica.nongnu.org/ ViewTube can be obatined from here: https://userscripts.org/scripts/show/87011Another nice script is LinkTube which provides direct links to embedded YouTube videos:
https://userscripts.org/scripts/show/119244
You can easily switch on and off scipts in Midori via Tools->Userscripts
