add firefox extension template

externs/webextension_polyfill/sidebaraction/GetPanelDetailsType.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef GetPanelDetailsType = {
+	/**
+		Specify the tab to get the panel from. If no tab nor window is specified, the global panel is returned.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+	/**
+		Specify the window to get the panel from. If no tab nor window is specified, the global panel is returned.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+};

externs/webextension_polyfill/sidebaraction/GetTitleDetailsType.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef GetTitleDetailsType = {
+	/**
+		Specify the tab to get the title from. If no tab nor window is specified, the global title is returned.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+	/**
+		Specify the window to get the title from. If no tab nor window is specified, the global title is returned.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+};

externs/webextension_polyfill/sidebaraction/ImageDataType.hx

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+package webextension_polyfill.sidebaraction;
+
+/**
+	Pixel data for an image. Must be an ImageData object (for example, from a <code>canvas</code> element).
+**/
+typedef ImageDataType = {
+	/**
+		Returns the one-dimensional array containing the data in RGBA order, as integers in the range 0 to 255.
+	**/
+	final data : js.lib.Uint8ClampedArray;
+	/**
+		Returns the actual dimensions of the data in the ImageData object, in pixels.
+	**/
+	final height : Float;
+	/**
+		Returns the actual dimensions of the data in the ImageData object, in pixels.
+	**/
+	final width : Float;
+};

externs/webextension_polyfill/sidebaraction/IsOpenDetailsType.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef IsOpenDetailsType = {
+	/**
+		Specify the window to get the openness from.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+};

externs/webextension_polyfill/sidebaraction/SetIconDetailsType.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef SetIconDetailsType = {
+	/**
+		Either an ImageData object or a dictionary {size -> ImageData} representing icon to be set.
+		If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density.
+		If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>
+		scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported.
+		At least one image must be specified. Note that 'details.imageData = foo' is equivalent to 'details.
+		imageData = {'19': foo}'
+		Optional.
+	**/
+	@:optional
+	var imageData : ts.AnyOf2<ImageDataType, haxe.DynamicAccess<ImageDataType>>;
+	/**
+		Either a relative image path or a dictionary {size -> relative image path} pointing to icon to be set.
+		If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density.
+		If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>
+		scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported.
+		At least one image must be specified. Note that 'details.path = foo' is equivalent to 'details.imageData = {'19': foo}'
+		Optional.
+	**/
+	@:optional
+	var path : ts.AnyOf2<String, SetIconDetailsTypePathC2Type>;
+	/**
+		Sets the sidebar icon for the tab specified by tabId. Automatically resets when the tab is closed.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+	/**
+		Sets the sidebar icon for the window specified by windowId.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+};

externs/webextension_polyfill/sidebaraction/SetIconDetailsTypePathC2Type.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef SetIconDetailsTypePathC2Type = { };

externs/webextension_polyfill/sidebaraction/SetPanelDetailsType.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef SetPanelDetailsType = {
+	/**
+		Sets the sidebar url for the tab specified by tabId. Automatically resets when the tab is closed.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+	/**
+		Sets the sidebar url for the window specified by windowId.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+	/**
+		The url to the html file to show in a sidebar.  If set to the empty string (''), no sidebar is shown.
+	**/
+	var panel : Null<String>;
+};

externs/webextension_polyfill/sidebaraction/SetTitleDetailsType.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef SetTitleDetailsType = {
+	/**
+		The string the sidebar action should display when moused over.
+	**/
+	var title : Null<String>;
+	/**
+		Sets the sidebar title for the tab specified by tabId. Automatically resets when the tab is closed.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+	/**
+		Sets the sidebar title for the window specified by windowId.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+};

externs/webextension_polyfill/sidebaraction/Static.hx

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+package webextension_polyfill.sidebaraction;
+
+typedef Static = {
+	/**
+		Sets the title of the sidebar action. This shows up in the tooltip.
+	**/
+	function setTitle(details:SetTitleDetailsType):js.lib.Promise<ts.Undefined>;
+	/**
+		Gets the title of the sidebar action.
+	**/
+	function getTitle(details:GetTitleDetailsType):js.lib.Promise<String>;
+	/**
+		Sets the icon for the sidebar action. The icon can be specified either as the path to an image file or as the pixel data
+		from a canvas element, or as dictionary of either one of those. Either the <strong>path</strong> or the <strong>
+		imageData</strong> property must be specified.
+	**/
+	function setIcon(details:SetIconDetailsType):js.lib.Promise<ts.Undefined>;
+	/**
+		Sets the url to the html document to be opened in the sidebar when the user clicks on the sidebar action's icon.
+	**/
+	function setPanel(details:SetPanelDetailsType):js.lib.Promise<ts.Undefined>;
+	/**
+		Gets the url to the html document set as the panel for this sidebar action.
+	**/
+	function getPanel(details:GetPanelDetailsType):js.lib.Promise<String>;
+	/**
+		Opens the extension sidebar in the active window.
+	**/
+	function open():js.lib.Promise<ts.Undefined>;
+	/**
+		Closes the extension sidebar in the active window if the sidebar belongs to the extension.
+	**/
+	function close():js.lib.Promise<ts.Undefined>;
+	/**
+		Toggles the extension sidebar in the active window.
+	**/
+	function toggle():Void;
+	/**
+		Checks whether the sidebar action is open.
+	**/
+	function isOpen(details:IsOpenDetailsType):js.lib.Promise<Bool>;
+};