BoxShooter(WebExtension)

It clicks because it parted as it searches for a CheckBox and a RadioButton, etc. that are the nearest from the mouse cursor. The batch processing that specifies the rectangular domain is also possible.

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manifest.json

{
  "name": "BoxShooter(WebExtension)",
  "version": "0.4.0.4resigned1",
  "manifest_version": 2,
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "icons": {
    "16": "boxshooter_16.png",
    "19": "boxshooter_19.png",
    "32": "boxshooter.png",
    "48": "boxshooter_48.png",
    "128": "boxshooter_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "*://*/*",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "boxshooter.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "boxshooter_19.png",
    "default_title": "BoxShooter",
    "default_popup": "popup.html",
    "browser_style": false
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "[email protected]"
    }
  }
}