Examine source code of Remove Blank Lines

{
  "manifest_version": 2,
  "name": "Remove Blank Lines",
  "version": "1.0",
  "description": "Removes blank lines from pasted text",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "{7febbd88-7e76-11ee-b962-0242ac120002}"
    }
  }
}