Examine source code of Picture Exif Cleaner

{
  "manifest_version": 2,
  "version": "1.0.5resigned1",
  "name": "Picture Exif Cleaner",
  "short_name": "Exif Cleaner",
  "title": "Remove Exif details from picture",
  "description": "Picture Exif data might compromise your privacy.\nClear pictures embedded properties before sharing or publishing.\n",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/picture-exif-cleaner/",
  "author": "Moris Papasmadov",
  "applications": {
    "gecko": {
      "id": "@pictureexifeditor",
      "strict_min_version": "45.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "32": "icons/redsc-32.png",
    "64": "icons/redsc-64.png",
    "128": "icons/redsc-128.png"
  },
  "browser_action": {
    "default_icon": "icons/redsc-32.png"
  }
}