for test
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manifest.json
{
"update_url": "https://clients2.google.com/service/update2/crx",
"manifest_version": 2,
"name": "Lab2 Simple app",
"version": "1",
"app": {
"background": {
"scripts": [
"main.js"
]
}
},
"icons": {
"128": "icon.png"
}
}