Always Left Tab

Always switch to left side tab,when the currently active tab is closed. only support Firefox Quantum 65 or later. Uses the new extension API,will never activates right side tab and then jump to left one.

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manifest.json

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "author": "Shenhp",
  "version": "0.1",
  "description": "__MSG_extensionDescription__",
  "default_locale": "zh",
  "icons": {
    "128": "./icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ]
}