Examine source code of e107 Dev

{
  "name": "e107 Dev",
  "version": "2.0.2",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "19": "assets/images/icon19.png",
      "38": "assets/images/icon38.png"
    },
    "default_popup": "index.html"
  },
  "icons": {
    "16": "assets/images/icon16.png",
    "48": "assets/images/icon48.png",
    "128": "assets/images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/js/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "assets/js/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "cookies",
    "storage",
    "contextMenus",
    "browsingData",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce54f00e-29ba-444c-ab72-f845d4c57612}",
      "strict_min_version": "79.0"
    }
  }
}