Examine source code of rebreader

{
  "manifest_version": 2,
  "name": "rebreader",
  "description": "Rebread non-free sites to private front-ends",
  "version": "1.1.2",
  "author": "nadvagauser",
  "homepage_url": "https://github.com/nadvagauser/rebreader",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>",
    "tabs"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rebreader@nadvagauser.github.io",
      "strict_min_version": "75.0"
    }
  }
}