xP: make the buffer list selectable by Vimium

xP/public/xP.js

@@ -1,4 +1,4 @@
-// Copyright (c) 2022, Přemysl Eric Janouch <p@janouch.name>
+// Copyright (c) 2022 - 2023, Přemysl Eric Janouch <p@janouch.name>
 // SPDX-License-Identifier: 0BSD
 import * as Relay from './proto.js'
 
@@ -462,14 +462,15 @@ let BufferList = {
 				classes.push('highlighted')
 				highlighted = true
 			}
-			return m('.item', {
+			// The role makes it selectable in VIM-like browser extensions.
+			return m('.item[role=tab]', {
 				onclick: event => bufferActivate(name),
 				class: classes.join(' '),
 			}, displayName)
 		})
 
 		updateIcon(rpc.ws === undefined ? null : highlighted)
-		return m('.list', {}, items)
+		return m('.list[role=tablist]', {}, items)
 	},
 }