Send from Gmail (by Google)

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Send from Gmail (by Google)",
  "version": "1.16",
  "description": "Makes Gmail your default email application and provides a button to compose a Gmail message to quickly share a link via email",
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "mailto.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "http://*.google.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_page": "options.html",
  "browser_action": {
    "default_icon": "images/gmail-extension-19.png",
    "default_title": "Send this link with Gmail"
  },
  "icons": {
    "16": "images/gmail-extension-16.png",
    "32": "images/gmail-extension-32.png",
    "64": "images/gmail-extension-64.png",
    "128": "images/gmail-extension-128.png"
  }
}