Examine source code of ColorTabs For Firefox

{
  "manifest_version": 2,
  "name": "ColorTabs",
  "version": "1.0.0",
  "description": "Color-code any Firefox tab independently using a color picker or favorites.",
  "author": "ColorTabs",
  "browser_specific_settings": {
    "gecko": {
      "id": "colortabs@colortabs",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "tabs",
    "menus",
    "storage",
    "sessions",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon-16.svg",
    "32": "icons/icon-32.svg",
    "48": "icons/icon-48.svg",
    "128": "icons/icon-128.svg"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.svg",
      "32": "icons/icon-32.svg",
      "48": "icons/icon-48.svg",
      "128": "icons/icon-128.svg"
    },
    "default_title": "ColorTabs — manage favorites",
    "default_popup": "color-picker/favorites.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ]
}