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manifest.json

{
  "manifest_version": 2,
  "version": "2.1",
  "name": "Indent lines in textarea with Tab",
  "description": "When you select several lines of text in textarea and press Tab, these lines will be indented. With Shift+Tab these lines will be unindented. Configure the number of spaces in the options page.",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "homepage_url": "https://gitlab.com/arty.name/firefox-extension-textarea-indent-tab",
  "browser_specific_settings": {
    "gecko": {
      "id": "{aef30b0f-bedb-446f-ada1-409a3472c538}"
    }
  }
}