把下面这行加入 userChrome.css 文件，将可以隐藏任何右键菜单选项。
#id1, #id2 { display:none !important; }
把 #id1, #id2 替换为下面的任何一项：(指明每个选项所对应的右键菜单选项)
#context-openlink Open Link in New Window
#context-openlinkintab Open Link in New Tab
#context-sep-open line separator
#context-bookmarklink Bookmark This Link…
#context-savelink Save Link As…
#context-sendlink Send Link…
#context-copyemail Copy Email Address
#context-copylink Copy Link Location
#context-sep-copylink line separator
#context-viewimage View Image
#context-copyimage-contents Copy Image
#context-copyimage Copy Image Location
#context-sep-copyimage line separator
#context-saveimage Save Image As…
#context-sendimage Send Image…
#context-setWallpaper Set As Wallpaper…
#context-blockimage Block Images from…
#context-back Back
#context-forward Forward
#context-reload Reload
#context-stop Stop
#context-sep-stop line separator
#context-bookmarkpage Bookmark This Page…
#context-savepage Save Page As…
#context-sendpage Send Page…
#context-sep-viewbgimage line separator
#context-viewbgimage View Background Image
#context-undo Undo
#context-sep-undo line separator
#context-cut Cut
#context-copy Copy
#context-paste Paste
#context-delete Delete
#context-sep-paste line separator
#context-selectall Select All
#context-sep-selectall line separator
#context-keywordfield Add a Keyword for this Search…
#context-searchselect Search Web for …
#frame-sep line separator
#frame This Frame
#context-sep-properties line separator
#context-viewpartialsource-selection View Selection Source
#context-viewpartialsource-mathml View MathML Source
#context-viewsource View Page Source
#context-viewinfo View Page Info
#context-metadata Properties
#context-sep-bidi line separator
#context-bidi-text-direction-toggle Switch Text Direction
#context-bidi-page-direction-toggle Switch Page Direction
例如，隐藏 “View Background”(查看背景) 菜单选项以及之后的水平线：
#context-viewbgimage,
#context-sep-viewbgimage {
display: none !important;
}
加上一段,在菜单项无效时隐藏
/*
* 隐藏右键菜单,不活动时隐藏
*/
#context-back[ disabled ="true"] ,
#context-forward[ disabled ="true"] ,
#context-stop[ disabled ="true"] ,
#context-viewbgimage[ disabled ="true"]{
display: none !important;
}
