Examine source code of Canvas Capture

{
  "manifest_version": 2,
  "name": "Canvas Capture",
  "version": "1.3.1resigned1",
  "description": "Capture video from canvas elements",
  "author": "Chase",
  "icons": {
    "16": "/img/png/icon_16.png",
    "32": "/img/png/icon_32.png",
    "48": "/img/png/icon_48.png",
    "64": "/img/png/icon_64.png",
    "128": "/img/png/icon_128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "notifications",
    "webNavigation",
    "http://*/",
    "https://*/"
  ],
  "background": {
    "scripts": [
      "lib/webextension-polyfill/browser-polyfill.min.js",
      "capture/utils.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "/options/options.html"
  },
  "browser_action": {
    "default_title": "Canvas Capture",
    "browser_style": false
  },
  "web_accessible_resources": [
    "/capture/*.html",
    "/capture/*.css",
    "/capture/img/*",
    "/capture/utils.js",
    "/wasm/worker.js",
    "/wasm/build/webm_muxer.js",
    "/wasm/build/webm_muxer.wasm"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "52.0",
      "id": "{864b7bc5-0342-403b-b67c-9a6bbaa6af3d}"
    }
  }
}