Grammar and Spell Checker - LanguageTool

With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.

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manifest.json

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "short_name": "LanguageTool",
  "description": "__MSG_appDesc__",
  "version": "8.6.0",
  "default_locale": "en",
  "author": "LanguageTooler GmbH",
  "homepage_url": "https://languagetool.org/",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "78.0",
      "id": "[email protected]"
    }
  },
  "icons": {
    "16": "assets/images/icons/icon16.png",
    "32": "assets/images/icons/icon32.png",
    "48": "assets/images/icons/icon48.png",
    "64": "assets/images/icons/icon64.png",
    "128": "assets/images/icons/icon128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "extension-loader.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "run_at": "document_idle"
    },
    {
      "all_frames": true,
      "match_about_blank": true,
      "css": [
        "common/fonts.css",
        "content/styles/styles.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "run_at": "document_idle"
    },
    {
      "all_frames": true,
      "js": [
        "content/gdocs/injector.js"
      ],
      "matches": [
        "*://docs.google.com/document/*"
      ],
      "run_at": "document_start"
    },
    {
      "all_frames": true,
      "js": [
        "content/languagetool/injector.js"
      ],
      "matches": [
        "*://languagetool.org/*"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": false,
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/images/icons/icon16.png",
      "32": "assets/images/icons/icon32.png",
      "64": "assets/images/icons/icon64.png"
    },
    "default_title": "LanguageTool",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "assets/fonts/*.woff2",
    "assets/styles/*",
    "common/*.css",
    "common/*.js",
    "content/*.css",
    "content.js",
    "extension-loader.js",
    "content/*.js",
    "config/*.js",
    "welcome/*.js",
    "welcome/welcome.css",
    "welcome/managedLoginRedirectUri.html",
    "welcome/loginRedirectUri.html",
    "welcome/templates/index.html",
    "assets/images/*"
  ]
}