I How to Create a toolbar for Firefox v4. I got this tutorial to do a toolbar http://blog.mozilla.com/addons/2009/01/28/how-to-develop-a-firefox-extension/ and I followed the steps to do it. The tutorial said that I can create a file with the id of the toolbar and inside I write the path of the toolbar. I did it and as soon firefox is loaded, the file that point to the path of the toolbar ddisappears. I created a profile for development and I'm working on that profile. Can any body tell me what wrong with that? If the tutorial it's not compatible with Firefox 4, where are the steps to create a toolbar for Firefox 4? I appreciate in advance your help. good night.