Text Highlighter v6

Highlight and annotate text on web pages.
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manifest.json
{
  "manifest_version": 2,
  "name": "Text Highlighter",
  "version": "1.0",
  "description": "Highlight and annotate text on web pages.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3fe8875-287f-4e93-96d4-df2bd0ee6267}"
    }
  }
}