Examine source code of Sound Effects

{
  "manifest_version": 2,
  "name": "Sound Effects",
  "description": "10 Band Graphic Equalizer/Chorus/Delay/Reverb",
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "js/contentscript.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "js/inject.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "img/icon19on.png",
    "default_title": "Sound Effects",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "48": "img/icon48.png",
    "96": "img/icon96.png"
  },
  "applications": {
    "gecko": {
      "id": "Sound_Effects_senna5150ando@gmail.com",
      "strict_min_version": "57.0"
    }
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "web_accessible_resources": [
    "Impulse/*",
    "js/*"
  ],
  "permissions": [
    "storage",
    "unlimitedStorage",
    "webNavigation",
    "tabs",
    "<all_urls>"
  ],
  "version": "1.2resigned1"
}