Examine source code of Like Hider

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "5.2.1",
  "description": "__MSG_extensionDescription__",
  "author": "Wesley Branton",
  "default_locale": "en",
  "developer": {
    "name": "Wesley Branton",
    "url": "http://addons.wesleybranton.com"
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "page_action": {
    "default_icon": {
      "19": "icons/icon-19.png",
      "38": "icons/icon-38.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "options/options.html?type=popup",
    "show_matches": [
      "*://*.facebook.com/*",
      "*://*.facebookcorewwwi.onion/*"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*",
        "*://*.facebookcorewwwi.onion/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "*://*.facebook.com/*",
    "*://*.facebookcorewwwi.onion/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8510d9a0-5780-4a8c-8bc8-aa500d01357a}"
    }
  }
}