how do i block some website which i think are harmful...there is no option yet
...a option to block website would have been good which we think are harmful or to block certain website like games
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BlockSite {web link} BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just displaying the link text without the clicking functionality.
Adblock Plus {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
Adblock Plus Pop-up Addon {web link} Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.
Forum; Adblock Plus Homepage {web link}
Known harmful site are blocked by Safe Browsing. http://www.mozilla.com/en-US/firefox/phishing-protection/