add firefox extension template

externs/webextension_polyfill/browsersettings/ColorManagementMode.hx

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+package webextension_polyfill.browsersettings;
+
+/**
+	Color management mode.
+**/
+typedef ColorManagementMode = String;

externs/webextension_polyfill/browsersettings/ContextMenuMouseEvent.hx

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+package webextension_polyfill.browsersettings;
+
+/**
+	After which mouse event context menus should popup.
+**/
+typedef ContextMenuMouseEvent = String;

externs/webextension_polyfill/browsersettings/ImageAnimationBehavior.hx

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+package webextension_polyfill.browsersettings;
+
+/**
+	How images should be animated in the browser.
+**/
+typedef ImageAnimationBehavior = String;

externs/webextension_polyfill/browsersettings/Static.hx

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+package webextension_polyfill.browsersettings;
+
+typedef Static = {
+	/**
+		Allows or disallows pop-up windows from opening in response to user events.
+	**/
+	var allowPopupsForUserEvents : webextension_polyfill.types.Setting;
+	/**
+		Enables or disables the browser cache.
+	**/
+	var cacheEnabled : webextension_polyfill.types.Setting;
+	/**
+		This boolean setting controls whether the selected tab can be closed with a double click.
+	**/
+	var closeTabsByDoubleClick : webextension_polyfill.types.Setting;
+	/**
+		Controls after which mouse event context menus popup. This setting's value is of type ContextMenuMouseEvent,
+		which has possible values of <code>mouseup</code> and <code>mousedown</code>.
+	**/
+	var contextMenuShowEvent : webextension_polyfill.types.Setting;
+	/**
+		Returns the value of the overridden home page. Read-only.
+	**/
+	var homepageOverride : webextension_polyfill.types.Setting;
+	/**
+		Controls the behaviour of image animation in the browser. This setting's value is of type ImageAnimationBehavior,
+		defaulting to <code>normal</code>.
+	**/
+	var imageAnimationBehavior : webextension_polyfill.types.Setting;
+	/**
+		Returns the value of the overridden new tab page. Read-only.
+	**/
+	var newTabPageOverride : webextension_polyfill.types.Setting;
+	/**
+		Controls where new tabs are opened. `afterCurrent` will open all new tabs next to the current tab,
+		`relatedAfterCurrent` will open only related tabs next to the current tab, and `atEnd` will open all tabs at the end of
+		the tab strip. The default is `relatedAfterCurrent`.
+	**/
+	var newTabPosition : webextension_polyfill.types.Setting;
+	/**
+		This boolean setting controls whether bookmarks are opened in the current tab or in a new tab.
+	**/
+	var openBookmarksInNewTabs : webextension_polyfill.types.Setting;
+	/**
+		This boolean setting controls whether search results are opened in the current tab or in a new tab.
+	**/
+	var openSearchResultsInNewTabs : webextension_polyfill.types.Setting;
+	/**
+		This boolean setting controls whether urlbar results are opened in the current tab or in a new tab.
+	**/
+	var openUrlbarResultsInNewTabs : webextension_polyfill.types.Setting;
+	/**
+		Disables webAPI notifications.
+	**/
+	var webNotificationsDisabled : webextension_polyfill.types.Setting;
+	/**
+		This setting controls whether the user-chosen colors override the page's colors.
+	**/
+	var overrideDocumentColors : webextension_polyfill.types.Setting;
+	/**
+		This setting controls whether a light or dark color scheme overrides the page's preferred color scheme.
+	**/
+	var overrideContentColorScheme : webextension_polyfill.types.Setting;
+	/**
+		This setting controls whether the document's fonts are used.
+	**/
+	var useDocumentFonts : webextension_polyfill.types.Setting;
+	/**
+		This boolean setting controls whether zoom is applied to the full page or to text only.
+	**/
+	var zoomFullPage : webextension_polyfill.types.Setting;
+	/**
+		This boolean setting controls whether zoom is applied on a per-site basis or to the current tab only. If privacy.
+		resistFingerprinting is true, this setting has no effect and zoom is applied to the current tab only.
+	**/
+	var zoomSiteSpecific : webextension_polyfill.types.Setting;
+	var colorManagement : webextension_polyfill.namespaces.browsersettings_colormanagement.browsersettingscolormanagement.Static;
+};