Disable Gmail "Add to Circles"

Disables the Google+ "Add to Circles" buttons in Gmail.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Disable Gmail \"Add to Circles\"",
  "version": "1.0.2016",
  "description": "Disables the Google+ \"Add to Circles\" buttons in Gmail.",
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/mail/*",
        "https://apis.google.com/u/*"
      ],
      "css": [
        "gmail.css"
      ],
      "all_frames": true
    }
  ]
}