Examine source code of Deadname-B-Gon

{
  "name": "Deadname-B-Gon",
  "version": "1.0",
  "description": "Deadname-B-Gon replaces a given name on sites you visit with a better one. Tested to guarantee works well with Gmail and more!",
  "browser_action": {
    "default_title": "Deadname-B-Gon",
    "default_icon": "imgs/bones-orig.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "imgs/bones016.png",
    "48": "imgs/bones048.png",
    "128": "imgs/bones128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "manifest_version": 2
}