Examine source code of TabMerger

{
  "manifest_version": 2,
  "version": "2.0.0",
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "author": "Lior Bragilevsky",
  "homepage_url": "https://lbragile.github.io/TabMerger-Extension/",
  "background": {
    "page": "background/background.html",
    "persistent": true
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "storage",
    "alarms",
    "downloads"
  ],
  "icons": {
    "16": "images/logo16.png",
    "48": "images/logo48.png",
    "128": "images/logo128.png"
  },
  "browser_action": {
    "default_icon": "images/logo128.png",
    "default_title": "Merge your tabs into groups"
  },
  "incognito": "spanning",
  "commands": {
    "merge-snly-menu": {
      "suggested_key": {
        "default": "Alt+O"
      },
      "description": "Merge ONLY Current"
    },
    "merge-all-menu": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "Merge ALL Tabs"
    },
    "merge-left-menu": {
      "suggested_key": {
        "default": "Alt+L"
      },
      "description": "Merge LEFT Tabs"
    },
    "merge-right-menu": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "Merge RIGHT Tabs"
    },
    "remove-visibility": {
      "description": "Exclude From Merging"
    },
    "merge-xcluding-menu": {
      "description": "Merge EXCLUDING Current"
    },
    "zdl-instructions": {
      "description": "Instructions & Help"
    },
    "aopen-tabmerger": {
      "description": "Open/Navigate to TabMerger"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{19feb84f-3a0b-4ca3-bbae-211b52eb158b}"
    }
  }
}