mpeg plugin for firefox / mozilla

This is totally annoying. Last night I did an automatic online update. Today I tried to download and save an mpeg file in both Mozilla and Firefox, only to gaze at a black kaffeine plug-in busy downloading the file for viewing. The plug-in was installed without asking. I was unable to find the plug-in in the list menu of either program. How can I get rid of this plug-in? -- How doth the little crocodile Improve his shining tail, And pour the waters of the Nile On every golden scale! How cheerfully he seems to grin, How neatly spreads his claws, And welcomes little fishes in, With gently smiling jaws! -- Lewis Carrol, "Alice in Wonderland"