Chrome拡張機能のpopup.js(popup.html)とbackground.jsとの間で通信するサンプルです。 manifest.json { "name": "communication between background.js and popup.js example", "version": "1.0", "description": "communication between background.js and popup.js", "content_scripts": [{ "matches": ["<all_urls>"], "js": ["content.js"] }], "background": { "scripts": ["background.js"], "persistent": false }, "browser_action": { "defaul