Examine source code of opal-bulk-marking

{
  "manifest_version": 2,
  "name": "opal-bulk-marking",
  "version": "1.3",
  "description": "Adds buttons in Opal that allow bulk downloading of submissions and bulk upload of corrections and marks.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://bildungsportal.sachsen.de/*"
      ],
      "js": [
        "./element_ids.js",
        "./text_handling.js",
        "./utils.js",
        "./bulk_download.js",
        "./bulk_upload.js",
        "./statistics.js",
        "./dom_editing.js",
        "./main.js"
      ],
      "css": [
        "./styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd732f70-f267-4611-8741-7a5b058bd032}"
    }
  }
}