Search and Wider Mail by Yahoo

manifest.json

{
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Yahoo",
      "keyword": "Yahoo",
      "search_url": "https://search.yahoo.com/search?p={searchTerms}&fr=yset_ff_syc_widemail&type=default",
      "favicon_url": "https://www.yahoo.com/favicon.ico",
      "is_default": true
    }
  },
  "manifest_version": 2,
  "name": "Search and Wider Mail by Yahoo",
  "description": "Expand your inbox. Set Yahoo as your default search and enjoy a wider view.",
  "version": "1.2.1",
  "applications": {
    "gecko": {
      "id": "@yahoo_wider_mail_extension",
      "strict_min_version": "55.0"
    }
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "cookies",
    "tabs",
    "https://*.mail.yahoo.com/*",
    "*://*.yahoo.com/*"
  ],
  "browser_action": {
    "default_title": "Yahoo Wider Mail",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "128": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "TrackingEncoder.js",
      "TrackingManager.js",
      "LogManager.js",
      "Constants.js",
      "BrowserGap.js",
      "WiderMailManager.js",
      "index.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mail.yahoo.com/*"
      ],
      "js": [
        "detectWiderMail.js"
      ]
    }
  ]
}