Tabs-Next/Prev (with tab counter ver.)

Make toolbar button to tab next/prev and close (with tab counter ver.).

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manifest.json

{
  "manifest_version": 2,
  "name": "Tabs-Next/Prev (with tab counter ver.)",
  "version": "0.2resigned1",
  "description": "Make toolbar button to tab next/prev and close (with tab counter ver.).",
  "icons": {
    "32": "icons/icon-32.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/icon-32.png",
    "default_title": "Tabs-Next/Prev (with tab counter ver.)",
    "default_popup": "tabs.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "strict_min_version": "54.0a1",
      "id": "{ab8945ab-2d2b-4056-b7aa-80ff915b91ff}"
    }
  }
}