Examine source code of FlareGet Integration

{
  "name": "FlareGet Integration",
  "version": "2.92resigned1",
  "description": "FlareGet Browser Integration extension replaces default download manager of Firefox by Flareget Download Manager.",
  "homepage_url": "http://www.flareget.com/",
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "support@flareget.com",
      "strict_min_version": "50.0"
    }
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "nativeMessaging"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ]
}