Examine source code of WebResearcherJS

{
  "manifest_version": 2,
  "name": "WebResearcherJS",
  "version": "9.0.2",
  "description": "https://github.com/kvgc153/WebResearcherJS",
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "contextMenus"
  ],
  "browser_action": {
    "default_title": "WebResearcherJS",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "webresearcher@webresearcher.io"
    }
  },
  "background": {
    "scripts": [
      "webresearcher/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "webresearcher/contentScript.js"
      ],
      "run_at": "document_start"
    }
  ]
}