Examine source code of Firelux

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "@firelux",
      "strict_min_version": "57.0"
    }
  },
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://framagit.org/ValentinG/firelux2",
  "version": "2.0.1.0",
  "author": "Valentin G",
  "developer": {
    "name": "Valentin G",
    "url": "https://framagit.org/ValentinG"
  },
  "default_locale": "en",
  "icons": {
    "48": "icons/firelux-48.png",
    "96": "icons/firelux-96.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "match_about_blank": true,
      "all_frames": false,
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "common/common.js",
        "content_scripts/page_script.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "16": "icons/firelux-16.png",
      "19": "icons/firelux-19.png",
      "32": "icons/firelux-32.png",
      "38": "icons/firelux-38.png",
      "48": "icons/firelux-48.png",
      "64": "icons/firelux-64.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup/panel.html",
    "default_area": "navbar"
  },
  "options_ui": {
    "page": "options/options.html"
  }
}