With Firefox 38.0.5, which is in Beta stage at the moment of this writing, Mozilla enabled a Reader View feature by default. Reader View strips out unnecessary elements from the opened web page, reflows the text and turns it into a cleaner looking text document without ads, menus and scripts, so the user can focus on reading the text content. If you are not going to use it, you might be interested in disabling Reader View and hide its icon from the address bar.
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