component {ddeafdac-cb39-47c4-9cb8-c9027ee36d26} BrowserElementParent.js contract @mozilla.org/browser-element-parent-factory;1 {ddeafdac-cb39-47c4-9cb8-c9027ee36d26} category app-startup BrowserElementParentFactory service,@mozilla.org/browser-element-parent-factory;1