Firefox about commands are actually a few special URLs, which begin with about: that you can type into the Location Bar to tweak the hidden settings of Firefox web browser.
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about:
Shows information about Firefox.
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about:blank
Shows a blank page
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about:home
Shows the Firefox home page with a Google search bar.
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about:addons
Shows the addons page
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about:sync-tabs
Shows tabs synced from other computers (tab syncing has to be enabled).
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about:credits
Shows credits
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about:license
Shows the Mozilla Public License.
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about:rights
Shows licensing information and your rights.
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about:logo
Shows the logo used on the about: screen.
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about:plugins
Shows installed, currently enabled plug-ins.
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about:buildconfig
Shows the arguments and options used to compile the Firefox build in use.
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about:cache
Shows information about the data in the browser cache.
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about:crashes
Shows details of crashes submitted by Mozilla’s crash reporter.
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about:memory
Shows memory usage.
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about:config
Shows the firefox configuration page with a lot of configuration options.
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about:support
Shows troubleshooting information.
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about:privatebrowsing
Can be used to switch to private browsing mode.
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about:sessionrestore
Shows an interface for viewing about last session.
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about:blocked
Shows the malware protection page used when the browser identifies a page as not safe for viewing.
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about:certerror
Shows the error page used when an SSL/TLS certificate is untrusted or otherwise invalid.
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about:feeds
Shows the page used when clicking the rss feed icon in the address bar.
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about:neterror
Shows the error page used when the browser could not access the requested path.
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about:permissions
This command shows the permissions given by you to different websites, like allowing to store passwords, share your location, allow cookies, open pop-up windows, and maintain offline storage.This is available in Firefox 6+ only.
For more information on these you may visit http://kb.mozillazine.org/About_protocol_links
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