Firefox Add-ons へようこそ。
Have you ever copied something to Thunderbird or Office and been annoyed that the text formatting (bold, font size, etc) came with it? Don't you wish you could just copy the text itself, without having to copy it, paste it into notepad, then copy it again? This extension gives you an option to copy text without the formatting. You can even set it to trim extra space in and around the copied text!