Examine source code of Images Hide

{
  "manifest_version": 2,
  "name": "Images Hide",
  "version": "1.0",
  "description": "hiding images on webpages to avoid distraction, it hides images when the webpage is loaded automatically, and if certain images are displayed later you can hide them by clicking on the toolbar button for this extension, you can also temporarily unhide an image by hovering on it with the mouse cursor",
  "icons": {
    "48": "icons/hide-48.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/hide-48.png",
    "default_title": "Images Hide"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d460f45d-b31f-46c7-9d69-eaf56ae5fe4b}"
    }
  }
}