Examine source code of MuteLinks

{
  "applications": {
    "gecko": {
      "id": "@mutelinks",
      "strict_min_version": "53.0"
    }
  },
  "developer": {
    "name": "Shaxine"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Mute Tabs based of URL",
  "icons": {
    "48": "icon48.png",
    "96": "icon.png"
  },
  "manifest_version": 2,
  "name": "MuteLinks",
  "options_ui": {
    "page": "options/options.html",
    "browser_style": false
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "version": "0.2.3resigned1"
}