Smart Back Buttons

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Smart Back Buttons",
  "version": "1.8",
  "description": "Easily go back a webpage just like a smartphone!",
  "manifest_version": 2,
  "permissions": [
    "activeTab",
    "history",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "javascript_keys.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "images/back_white16.png",
    "images/forward_white16.png",
    "images/smart_back48.png",
    "images/unpinned.png",
    "images/pinned.png",
    "images/close_button.png"
  ],
  "icons": {
    "16": "images/smart_back16.png",
    "32": "images/smart_back32.png",
    "48": "images/smart_back48.png",
    "128": "images/smart_back128.png"
  },
  "commands": {
    "new-tab": {
      "suggested_key": {
        "default": "Alt+H"
      },
      "description": "Opens new tab"
    },
    "close-tab": {
      "suggested_key": {
        "default": "Alt+C"
      },
      "description": "Close tab"
    },
    "previous-tab": {
      "suggested_key": {
        "default": "Alt+B"
      },
      "description": "Previous tab"
    }
  }
}