Examine source code of HardRefresh

{
  "manifest_version": 2,
  "name": "Hard Refresh",
  "version": "1.1resigned1",
  "description": "Add context menu for performing hard refresh (CTRL+F5). This add-on is a remake of the legacy Hard Refresh plugin. We thank for all the comments and feedback. The original add-on is very old and we haven't been maintaining it for so long we lost access to our dev page...",
  "applications": {
    "gecko": {
      "id": "hard-refresh@the_three_geeks.com"
    }
  },
  "icons": {
    "48": "icons/hardrefresh-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ]
}