Examine source code of SHAPass

{
  "manifest_version": 2,
  "name": "SHAPass",
  "description": "Gestionnaire de mots de passe unique par site",
  "version": "0.0.6resigned1",
  "icons": {
    "19": "lock20.png",
    "20": "lock20.png",
    "32": "lock32.png",
    "48": "lock48.png",
    "64": "lock64.png",
    "128": "lock128.png",
    "256": "lock256.png",
    "512": "lock512.png"
  },
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "SHAPass",
    "default_popup": "popup.html",
    "default_icon": {
      "19": "lock20.png",
      "20": "lock20.png",
      "32": "lock32.png",
      "48": "lock48.png",
      "64": "lock64.png",
      "128": "lock128.png",
      "256": "lock256.png",
      "512": "lock512.png"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "clipboardWrite"
  ],
  "author": "Jean Philippe Crevoisier <jpcrevoisier@gmail.com>",
  "update_url": "https://github.com/jpcrevoisier/SHAPass/raw/master/Extensions/updates.xml",
  "browser_specific_settings": {
    "gecko": {
      "id": "{09e3d5fb-1816-4937-aef7-69c883926dd1}"
    }
  }
}