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+.. -*- Mode: rst; fill-column: 100; -*-
+
+==========================
+ Shipping Default Domains
+==========================
+
+Firefox for Mobile (Android and iOS) ships sets of default content in order to improve the
+first-run experience. There are two primary places where default sets of domains are used: URLBar
+domain auto-completion, and Top Sites suggested thumbnails.
+
+The source of these domains is typically the Alexa top sites lists, global and by-country. Before
+shipping the sets of domains, the lists are sanitized.
+
+Domain Auto-completion
+======================
+
+As you type in the URLBar, Firefox will scan your history and auto-complete previously visited
+domains that match what you have entered. This can make navigating to web sites faster because it
+can avoid significant amounts of typing. During your first few uses, Firefox does not have any
+history and you are forced to type full URLs. Shipping a set of top domains provides a fallback.
+
+The top domains list can be localized, but Firefox will fallback to using en-US as the default for all
+locales that do not provide a specific set. The list can have several hundred domains, but due to
+size concerns, is usually capped to five hundred or less.
+
+Sanitizing Methods
+------------------
+
+After getting a source list, e.g. Alexa top global sites, we apply some simple guidelines to the
+list of domains:
+
+
+* Remove any sites in the Alexa adult site list.
+* Remove any locale-specific domain duplicates. We assume primary URLs (.com) will redirect to the
+  correct locale (.co.jp) at run-time.
+* Remove any explicit adult content* domains.
+* Remove any sites that use explicit or adult advertising*.
+* Remove any URL shorteners and redirecters.
+* Remove any content/CDN domains. Some sites use separate domains to store images and other static content.
+* Remove any sites primarily used for advertising or management of advertising.
+* Remove any sites that fail to load in mobile browsers.
+* Remove any time/date specific sites that may have appeared on the list due to seasonal spikes.
+
+Suggested Sites
+===============
+
+Suggested sites are default thumbnails, displayed on the Top Sites home panel. A suggested site
+consists of a title, thumbnail image, background color and URL. Multiple images are usually
+required to handle the variety of device DPIs.
+
+Suggested sites can be localized, but Firefox will fallback to using en-US as the default for all
+locales that do not provide a specific set. The list is usually small, with perhaps fewer than ten
+sites.
+
+Sanitizing Methods
+------------------
+
+After getting a source list, e.g. Alexa top global sites, we apply some simple guidelines to the
+list of domains:
+
+* Remove pure search engines. We handle search engines differently and don't consider them to be
+  suggested sites.
+* Remove any locale-specific domain duplicates. We assume primary URLs (.com) will redirect to the
+  correct locale (.co.jp) at run-time.
+* Remove any explicit adult content domains.
+* Remove any sites that use explicit or adult advertising.
+* Remove any URL shorteners and redirecters.
+* Remove any content/CDN domains. Some sites use separate domains to store images and other static
+  content.
+
+Guidelines for Adult Content
+============================
+
+Generally the Adult category includes sites whose dominant theme is either:
+
+* To appeal to the prurient interest in sex without any serious literary, artistic, political, or
+  scientific value
+* The depiction or description of nudity, including sexual or excretory activities or organs in a
+  lascivious way
+* The depiction or description of sexually explicit conduct in a lascivious way (e.g. for
+  entertainment purposes)
+
+For a more complete definition and guidelines of adult content, use the full DMOZ guidelines at
+http://www.dmoz.org/docs/en/guidelines/adult/general.html.
+
+Updating Lists
+==============
+
+After approximately every two releases, Product (with Legal) will review current lists and
+sanitizing methods, and update the lists accordingly.