add firefox extension template

externs/webextension_polyfill/events/Event.hx

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+package webextension_polyfill.events;
+
+/**
+	An object which allows the addition and removal of listeners for a Chrome event.
+**/
+typedef Event<T> = {
+	/**
+		Registers an event listener <em>callback</em> to an event.
+	**/
+	function addListener(callback:T, params:haxe.extern.Rest<Dynamic>):Void;
+	/**
+		Deregisters an event listener <em>callback</em> from an event.
+	**/
+	function removeListener(callback:T):Void;
+	function hasListener(callback:T):Bool;
+	function hasListeners():Bool;
+};

externs/webextension_polyfill/events/Rule.hx

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+package webextension_polyfill.events;
+
+/**
+	Description of a declarative rule for handling events.
+**/
+typedef Rule = {
+	/**
+		Optional identifier that allows referencing this rule.
+		Optional.
+	**/
+	@:optional
+	var id : String;
+	/**
+		Tags can be used to annotate rules and perform operations on sets of rules.
+		Optional.
+	**/
+	@:optional
+	var tags : Array<String>;
+	/**
+		List of conditions that can trigger the actions.
+	**/
+	var conditions : Array<Dynamic>;
+	/**
+		List of actions that are triggered if one of the condtions is fulfilled.
+	**/
+	var actions : Array<Dynamic>;
+	/**
+		Optional priority of this rule. Defaults to 100.
+		Optional.
+	**/
+	@:optional
+	var priority : Float;
+};

externs/webextension_polyfill/events/Static.hx

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+package webextension_polyfill.events;
+
+typedef Static = { };

externs/webextension_polyfill/events/UrlFilter.hx

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+package webextension_polyfill.events;
+
+/**
+	Filters URLs for various criteria. See <a href='events#filtered'>event filtering</a>. All criteria are case sensitive.
+**/
+typedef UrlFilter = {
+	/**
+		Matches if the host name of the URL contains a specified string. To test whether a host name component has a prefix
+		'foo', use hostContains: '.foo'. This matches 'www.foobar.com' and 'foo.com', because an implicit dot is added at the
+		beginning of the host name. Similarly, hostContains can be used to match against component suffix ('foo.')
+		and to exactly match against components ('.foo.'). Suffix- and exact-matching for the last components need to be done
+		separately using hostSuffix, because no implicit dot is added at the end of the host name.
+		Optional.
+	**/
+	@:optional
+	var hostContains : String;
+	/**
+		Matches if the host name of the URL is equal to a specified string.
+		Optional.
+	**/
+	@:optional
+	var hostEquals : String;
+	/**
+		Matches if the host name of the URL starts with a specified string.
+		Optional.
+	**/
+	@:optional
+	var hostPrefix : String;
+	/**
+		Matches if the host name of the URL ends with a specified string.
+		Optional.
+	**/
+	@:optional
+	var hostSuffix : String;
+	/**
+		Matches if the path segment of the URL contains a specified string.
+		Optional.
+	**/
+	@:optional
+	var pathContains : String;
+	/**
+		Matches if the path segment of the URL is equal to a specified string.
+		Optional.
+	**/
+	@:optional
+	var pathEquals : String;
+	/**
+		Matches if the path segment of the URL starts with a specified string.
+		Optional.
+	**/
+	@:optional
+	var pathPrefix : String;
+	/**
+		Matches if the path segment of the URL ends with a specified string.
+		Optional.
+	**/
+	@:optional
+	var pathSuffix : String;
+	/**
+		Matches if the query segment of the URL contains a specified string.
+		Optional.
+	**/
+	@:optional
+	var queryContains : String;
+	/**
+		Matches if the query segment of the URL is equal to a specified string.
+		Optional.
+	**/
+	@:optional
+	var queryEquals : String;
+	/**
+		Matches if the query segment of the URL starts with a specified string.
+		Optional.
+	**/
+	@:optional
+	var queryPrefix : String;
+	/**
+		Matches if the query segment of the URL ends with a specified string.
+		Optional.
+	**/
+	@:optional
+	var querySuffix : String;
+	/**
+		Matches if the URL (without fragment identifier) contains a specified string. Port numbers are stripped from the URL if
+		they match the default port number.
+		Optional.
+	**/
+	@:optional
+	var urlContains : String;
+	/**
+		Matches if the URL (without fragment identifier) is equal to a specified string. Port numbers are stripped from the URL
+		if they match the default port number.
+		Optional.
+	**/
+	@:optional
+	var urlEquals : String;
+	/**
+		Matches if the URL (without fragment identifier) matches a specified regular expression.
+		Port numbers are stripped from the URL if they match the default port number. The regular expressions use the <a
+		href="https://github.com/google/re2/blob/master/doc/syntax.txt">RE2 syntax</a>.
+		Optional.
+	**/
+	@:optional
+	var urlMatches : String;
+	/**
+		Matches if the URL without query segment and fragment identifier matches a specified regular expression.
+		Port numbers are stripped from the URL if they match the default port number. The regular expressions use the <a
+		href="https://github.com/google/re2/blob/master/doc/syntax.txt">RE2 syntax</a>.
+		Optional.
+	**/
+	@:optional
+	var originAndPathMatches : String;
+	/**
+		Matches if the URL (without fragment identifier) starts with a specified string. Port numbers are stripped from the URL
+		if they match the default port number.
+		Optional.
+	**/
+	@:optional
+	var urlPrefix : String;
+	/**
+		Matches if the URL (without fragment identifier) ends with a specified string. Port numbers are stripped from the URL if
+		they match the default port number.
+		Optional.
+	**/
+	@:optional
+	var urlSuffix : String;
+	/**
+		Matches if the scheme of the URL is equal to any of the schemes specified in the array.
+		Optional.
+	**/
+	@:optional
+	var schemes : Array<String>;
+	/**
+		Matches if the port of the URL is contained in any of the specified port lists. For example <code>[80, 443, [1000, 1200]]
+		</code> matches all requests on port 80, 443 and in the range 1000-1200.
+		Optional.
+	**/
+	@:optional
+	var ports : Array<ts.AnyOf2<Float, ts.Tuple2<Float, Float>>>;
+};